Guide d'implémentation Fr Core
2.1.0 - trial-use France flag

This page is part of the Guide d'implémentation Fr Core (v2.1.0: Release) based on FHIR (HL7® FHIR® Standard) R4. This is the current published version in its permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions

Resource Profile: FRCoreObservationBpProfile - Detailed Descriptions

Active as of 2024-09-04

Definitions for the fr-core-observation-bp resource profile.

Guidance on how to interpret the contents of this table can be found here

0. Observation
2. Observation.meta
4. Observation.meta.profile
SlicingThis element introduces a set of slices on Observation.meta.profile. The slices areUnordered and Open, and can be differentiated using the following discriminators:
  • value @ $this
  • 6. Observation.meta.profile:fr-canonical
    Slice Namefr-canonical
    Control0..1
    Pattern Valuehttps://hl7.fr/ig/fhir/core/StructureDefinition/fr-core-observation-bp
    8. Observation.extension:supportingInfo
    Slice NamesupportingInfo
    Control0..1
    TypeExtension(Supporting info) (Extension Type: Reference(Resource))
    10. Observation.code
    12. Observation.code.coding
    Control1..?
    14. Observation.encounter
    TypeReference(FR Core Encounter Profile)
    16. Observation.effective[x]
    Definition

    Often just a dateTime for Vital Signs

    [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
    18. Observation.performer
    TypeReference(CareTeam, FR Core Patient Profile, FR Core Practitioner Profile, PractitionerRole, FR Core Organization Profile, FR Core Related Person Profile)
    20. Observation.value[x]
    Control0..0
    SlicingThis element introduces a set of slices on Observation.value[x]. The slices areUnordered and Open, and can be differentiated using the following discriminators:
    • type @ $this
    • 22. Observation.bodySite
      BindingFor example codes, see http://hl7.org/fhir/hspc/ValueSet/bpMeasBodyLocationPrecoordVS
      (example to http://hl7.org/fhir/hspc/ValueSet/bpMeasBodyLocationPrecoordVS)
      24. Observation.method
      BindingFor example codes, see https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-bp-measurement-method
      (example to https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-bp-measurement-method)
      26. Observation.component:SystolicBP
      Slice NameSystolicBP
      28. Observation.component:SystolicBP.code
      30. Observation.component:SystolicBP.code.coding
      Control1..?
      32. Observation.component:SystolicBP.value[x]
      [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
      SlicingThis element introduces a set of slices on Observation.component.value[x]. The slices areUnordered and Open, and can be differentiated using the following discriminators:
      • type @ $this
      • 34. Observation.component:SystolicBP.referenceRange
        TypeSeettp://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange
        36. Observation.component:DiastolicBP
        Slice NameDiastolicBP
        Definition

        Used when reporting diastolic blood pressure.

        ShortUsed when reporting diastolic blood pressure.
        38. Observation.component:DiastolicBP.code
        40. Observation.component:DiastolicBP.code.coding
        Control1..?
        42. Observation.component:DiastolicBP.value[x]
        [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
        SlicingThis element introduces a set of slices on Observation.component.value[x]. The slices areUnordered and Open, and can be differentiated using the following discriminators:
        • type @ $this
        • 44. Observation.component:DiastolicBP.referenceRange
          TypeSeettp://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange
          46. Observation.component:MeanBP
          Slice NameMeanBP
          Definition

          Mean blood pressure

          ShortMean blood pressure
          Control0..1
          48. Observation.component:MeanBP.code
          50. Observation.component:MeanBP.code.coding
          Control1..?
          SlicingThis element introduces a set of slices on Observation.component.code.coding. The slices areUnordered and Open, and can be differentiated using the following discriminators:
          • value @ code
          • value @ system
          • 52. Observation.component:MeanBP.code.coding:MBPCode
            Slice NameMBPCode
            Control1..1
            54. Observation.component:MeanBP.code.coding:MBPCode.system
            Control1..?
            Fixed Valuehttp://loinc.org
            56. Observation.component:MeanBP.code.coding:MBPCode.code
            Definition

            Mean blood pressure

            ShortMean blood pressure
            Control1..?
            Fixed Value8478-0
            58. Observation.component:MeanBP.referenceRange
            TypeSeettp://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange

            Guidance on how to interpret the contents of this table can be found here

            0. Observation
            Definition

            This profile defines how to represent Blood Pressure observations in FHIR using a standard LOINC code and UCUM units of measure. This is a grouping structure. It has no value in Observation.valueQuantity but contains at least one component (systolic and/or diastolic).


            Measurements and simple assertions made about a patient, device or other subject.

            ShortFHIR Blood Pressure ProfileMeasurements and simple assertions
            Comments

            Used for simple observations such as device measurements, laboratory atomic results, vital signs, height, weight, smoking status, comments, etc. Other resources are used to provide context for observations such as laboratory reports, etc.

            Control0..*
            Is Modifierfalse
            Summaryfalse
            Alternate NamesVital Signs, Measurement, Results, Tests
            Invariantsdom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources (contained.contained.empty())
            dom-3: If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource (contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty())
            dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated (contained.meta.versionId.empty() and contained.meta.lastUpdated.empty())
            dom-5: If a resource is contained in another resource, it SHALL NOT have a security label (contained.meta.security.empty())
            dom-6: A resource should have narrative for robust management (text.`div`.exists())
            obs-6: dataAbsentReason SHALL only be present if Observation.value[x] is not present (dataAbsentReason.empty() or value.empty())
            obs-7: If Observation.code is the same as an Observation.component.code then the value element associated with the code SHALL NOT be present (value.empty() or component.code.where(coding.intersect(%resource.code.coding).exists()).empty())
            vs-2: If there is no component or hasMember element then either a value[x] or a data absent reason must be present. ((component.empty() and hasMember.empty()) implies (dataAbsentReason.exists() or value.exists()))
            obs-6: dataAbsentReason SHALL only be present if Observation.value[x] is not present (dataAbsentReason.empty() or value.empty())
            obs-7: If Observation.code is the same as an Observation.component.code then the value element associated with the code SHALL NOT be present (value.empty() or component.code.where(coding.intersect(%resource.code.coding).exists()).empty())
            2. Observation.implicitRules
            Definition

            A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc.

            ShortA set of rules under which this content was created
            Comments

            Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc.

            Control0..1
            Typeuri
            Is Modifiertrue because This element is labeled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation
            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
            Summarytrue
            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
            4. Observation.extension:supportingInfo
            Slice NamesupportingInfo
            Definition

            Other resources from the patient record that may be relevant to the event. The information from these resources was either used to create the instance or is provided to help with its interpretation. This extension should not be used if more specific inline elements or extensions are available. For example, use Observation.hasMember instead of supportingInformation for representing the members of an Observation panel.

            ShortOther information that may be relevant to this event.
            Control0..1
            TypeExtension(Supporting info) (Extension Type: Reference(Resource))
            Is Modifierfalse
            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
            ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
            6. Observation.modifierExtension
            Definition

            May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

            Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

            ShortExtensions that cannot be ignored
            Comments

            There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

            Control0..*
            TypeExtension
            Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the resource that contains them
            Summaryfalse
            Requirements

            Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.


            Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

            Alternate Namesextensions, user content
            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
            8. Observation.status
            Definition

            The status of the result value.

            Shortregistered | preliminary | final | amended +
            Comments

            This element is labeled as a modifier because the status contains codes that mark the resource as not currently valid.

            Control1..1
            BindingThe codes SHALL be taken from ObservationStatushttp://hl7.org/fhir/ValueSet/observation-status|4.0.1
            (required to http://hl7.org/fhir/ValueSet/observation-status|4.0.1)
            Typecode
            Is Modifiertrue because This element is labeled as a modifier because it is a status element that contains status entered-in-error which means that the resource should not be treated as valid
            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
            Must Supporttrue
            Summarytrue
            Requirements

            Need to track the status of individual results. Some results are finalized before the whole report is finalized.

            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
            10. Observation.category
            Definition

            A code that classifies the general type of observation being made.

            ShortClassification of type of observation
            Comments

            In addition to the required category valueset, this element allows various categorization schemes based on the owner’s definition of the category and effectively multiple categories can be used at once. The level of granularity is defined by the category concepts in the value set.

            Control10..*
            BindingThe codes SHOULD be taken from ObservationCategoryCodeshttp://hl7.org/fhir/ValueSet/observation-category
            (preferred to http://hl7.org/fhir/ValueSet/observation-category)

            Codes for high level observation categories.

            TypeCodeableConcept
            Is Modifierfalse
            Must Supporttrue
            Summaryfalse
            Requirements

            Used for filtering what observations are retrieved and displayed.

            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
            SlicingThis element introduces a set of slices on Observation.category. The slices areUnordered and Open, and can be differentiated using the following discriminators:
            • value @ coding.code
            • value @ coding.system
            • 12. Observation.category:VSCat
              Slice NameVSCat
              Definition

              A code that classifies the general type of observation being made.

              ShortClassification of type of observation
              Comments

              In addition to the required category valueset, this element allows various categorization schemes based on the owner’s definition of the category and effectively multiple categories can be used at once. The level of granularity is defined by the category concepts in the value set.

              Control10..1*
              BindingThe codes SHOULD be taken from ObservationCategoryCodeshttp://hl7.org/fhir/ValueSet/observation-category
              (preferred to http://hl7.org/fhir/ValueSet/observation-category)

              Codes for high level observation categories.

              TypeCodeableConcept
              Is Modifierfalse
              Must Supporttrue
              Summaryfalse
              Requirements

              Used for filtering what observations are retrieved and displayed.

              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
              14. Observation.category:VSCat.coding
              Definition

              A reference to a code defined by a terminology system.

              ShortCode defined by a terminology system
              Comments

              Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

              Control10..*
              TypeCoding
              Is Modifierfalse
              Must Supporttrue
              Summarytrue
              Requirements

              Allows for alternative encodings within a code system, and translations to other code systems.

              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
              16. Observation.category:VSCat.coding.system
              Definition

              The identification of the code system that defines the meaning of the symbol in the code.

              ShortIdentity of the terminology system
              Comments

              The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.

              Control10..1
              Typeuri
              Is Modifierfalse
              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
              Must Supporttrue
              Summarytrue
              Requirements

              Need to be unambiguous about the source of the definition of the symbol.

              Fixed Valuehttp://terminology.hl7.org/CodeSystem/observation-category
              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
              18. Observation.category:VSCat.coding.code
              Definition

              A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).

              ShortSymbol in syntax defined by the system
              Control10..1
              Typecode
              Is Modifierfalse
              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
              Must Supporttrue
              Summarytrue
              Requirements

              Need to refer to a particular code in the system.

              Fixed Valuevital-signs
              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
              20. Observation.code
              Definition

              Blood Pressure.


              Describes what was observed. Sometimes this is called the observation "name".

              ShortBlood PressureType of observation (code / type)
              Comments

              additional codes that translate or map to this code are allowed. For example a more granular LOINC code or code that is used locally in a system.


              All code-value and, if present, component.code-component.value pairs need to be taken into account to correctly understand the meaning of the observation.

              Control1..1
              BindingUnless not suitable, these codes SHALL be taken from For example codes, see VitalSignshttp://hl7.org/fhir/ValueSet/observation-codes
              (extensible to http://hl7.org/fhir/ValueSet/observation-vitalsignresult)

              This identifies the vital sign result type.


              Codes identifying names of simple observations.

              TypeCodeableConcept
              Is Modifierfalse
              Must Supporttrue
              Summarytrue
              Requirements
              1. SHALL contain exactly one [1..1] code, where the @code SHOULD be selected from ValueSet HITSP Vital Sign Result Type 2.16.840.1.113883.3.88.12.80.62 DYNAMIC (CONF:7301).

              Knowing what kind of observation is being made is essential to understanding the observation.

              Alternate NamesName, Test
              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
              22. Observation.code.coding
              Definition

              A reference to a code defined by a terminology system.

              ShortCode defined by a terminology system
              Comments

              Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

              Control10..*
              TypeCoding
              Is Modifierfalse
              Summarytrue
              Requirements

              Allows for alternative encodings within a code system, and translations to other code systems.

              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
              SlicingThis element introduces a set of slices on Observation.code.coding. The slices areUnordered and Open, and can be differentiated using the following discriminators:
              • value @ code
              • value @ system
              • 24. Observation.code.coding:BPCode
                Slice NameBPCode
                Definition

                A reference to a code defined by a terminology system.

                ShortCode defined by a terminology system
                Comments

                Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                Control10..1*
                TypeCoding
                Is Modifierfalse
                Summarytrue
                Requirements

                Allows for alternative encodings within a code system, and translations to other code systems.

                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                26. Observation.code.coding:BPCode.system
                Definition

                The identification of the code system that defines the meaning of the symbol in the code.

                ShortIdentity of the terminology system
                Comments

                The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.

                Control10..1
                Typeuri
                Is Modifierfalse
                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                Summarytrue
                Requirements

                Need to be unambiguous about the source of the definition of the symbol.

                Fixed Valuehttp://loinc.org
                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                28. Observation.code.coding:BPCode.code
                Definition

                A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).

                ShortSymbol in syntax defined by the system
                Control10..1
                Typecode
                Is Modifierfalse
                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                Summarytrue
                Requirements

                Need to refer to a particular code in the system.

                Fixed Value85354-9
                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                30. Observation.subject
                Definition

                The patient, or group of patients, location, or device this observation is about and into whose record the observation is placed. If the actual focus of the observation is different from the subject (or a sample of, part, or region of the subject), the focus element or the code itself specifies the actual focus of the observation.

                ShortWho and/or what the observation is about
                Comments

                One would expect this element to be a cardinality of 1..1. The only circumstance in which the subject can be missing is when the observation is made by a device that does not know the patient. In this case, the observation SHALL be matched to a patient through some context/channel matching technique, and at this point, the observation should be updated.

                Control10..1
                TypeReference(Patient, Group, Device, Location)
                Is Modifierfalse
                Must Supporttrue
                Summarytrue
                Requirements

                Observations have no value if you don't know who or what they're about.

                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                32. Observation.encounter
                Definition

                The healthcare event (e.g. a patient and healthcare provider interaction) during which this observation is made.

                ShortHealthcare event during which this observation is made
                Comments

                This will typically be the encounter the event occurred within, but some events may be initiated prior to or after the official completion of an encounter but still be tied to the context of the encounter (e.g. pre-admission laboratory tests).

                Control0..1
                TypeReference(FR Core Encounter Profile, Encounter)
                Is Modifierfalse
                Summarytrue
                Requirements

                For some observations it may be important to know the link between an observation and a particular encounter.

                Alternate NamesContext
                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                34. Observation.effective[x]
                Definition

                Often just a dateTime for Vital Signs


                The time or time-period the observed value is asserted as being true. For biological subjects - e.g. human patients - this is usually called the "physiologically relevant time". This is usually either the time of the procedure or of specimen collection, but very often the source of the date/time is not known, only the date/time itself.

                ShortOften just a dateTime for Vital SignsClinically relevant time/time-period for observation
                Comments

                At least a date should be present unless this observation is a historical report. For recording imprecise or "fuzzy" times (For example, a blood glucose measurement taken "after breakfast") use the Timing datatype which allow the measurement to be tied to regular life events.


                At least a date should be present unless this observation is a historical report. For recording imprecise or "fuzzy" times (For example, a blood glucose measurement taken "after breakfast") use the Timing datatype which allow the measurement to be tied to regular life events.

                Control10..1
                This element is affected by the following invariants: vs-1
                TypeChoice of: dateTime, Period, Timing, instant
                [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                Is Modifierfalse
                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                Must Supporttrue
                Must Support TypesNo must-support rules about the choice of types/profiles
                Summarytrue
                Requirements

                Knowing when an observation was deemed true is important to its relevance as well as determining trends.

                Alternate NamesOccurrence
                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                vs-1: if Observation.effective[x] is dateTime and has a value then that value shall be precise to the day ($this is dateTime implies $this.toString().length() >= 10)
                36. Observation.performer
                Definition

                Who was responsible for asserting the observed value as "true".

                ShortWho is responsible for the observation
                Control0..*
                TypeReference(CareTeam, FR Core Patient Profile, FR Core Practitioner Profile, PractitionerRole, FR Core Organization Profile, FR Core Related Person Profile, Practitioner, Organization, Patient, RelatedPerson)
                Is Modifierfalse
                Summarytrue
                Requirements

                May give a degree of confidence in the observation and also indicates where follow-up questions should be directed.

                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                38. Observation.value[x]
                Definition

                Vital Signs value are recorded using the Quantity data type. For supporting observations such as Cuff size could use other datatypes such as CodeableConcept.


                The information determined as a result of making the observation, if the information has a simple value.

                ShortVital Signs value are recorded using the Quantity data type. For supporting observations such as Cuff size could use other datatypes such as CodeableConcept.Actual result
                Comments

                An observation may have; 1) a single value here, 2) both a value and a set of related or component values, or 3) only a set of related or component values. If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.


                An observation may have; 1) a single value here, 2) both a value and a set of related or component values, or 3) only a set of related or component values. If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                Control0..01
                This element is affected by the following invariants: obs-7, vs-2
                TypeQuantity, dateTime, boolean, string, SampledData, Period, Ratio, integer, time, Range, CodeableConcept
                Is Modifierfalse
                Must Supporttrue
                Summarytrue
                Requirements
                1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).

                An observation exists to have a value, though it might not if it is in error, or if it represents a group of observations.

                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                SlicingThis element introduces a set of slices on Observation.value[x]. The slices areUnordered and Closed, and can be differentiated using the following discriminators:
                • type @ $this
                • 40. Observation.value[x]:valueQuantity
                  Slice NamevalueQuantity
                  Definition

                  Vital Signs value are recorded using the Quantity data type. For supporting observations such as Cuff size could use other datatypes such as CodeableConcept.


                  The information determined as a result of making the observation, if the information has a simple value.

                  ShortVital Signs value are recorded using the Quantity data type. For supporting observations such as Cuff size could use other datatypes such as CodeableConcept.Actual result
                  Comments

                  An observation may have; 1) a single value here, 2) both a value and a set of related or component values, or 3) only a set of related or component values. If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.


                  An observation may have; 1) a single value here, 2) both a value and a set of related or component values, or 3) only a set of related or component values. If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                  Control0..01
                  This element is affected by the following invariants: obs-7, vs-2
                  TypeQuantity, dateTime, boolean, string, SampledData, Period, Ratio, integer, time, Range, CodeableConcept
                  Is Modifierfalse
                  Must Supporttrue
                  Summarytrue
                  Requirements
                  1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).

                  An observation exists to have a value, though it might not if it is in error, or if it represents a group of observations.

                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  42. Observation.dataAbsentReason
                  Definition

                  Provides a reason why the expected value in the element Observation.value[x] is missing.

                  ShortWhy the result is missing
                  Comments

                  Null or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "specimen unsatisfactory".

                  The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Note that an observation may only be reported if there are values to report. For example differential cell counts values may be reported only when > 0. Because of these options, use-case agreements are required to interpret general observations for null or exceptional values.

                  Control0..1
                  This element is affected by the following invariants: obs-6, vs-2
                  BindingUnless not suitable, these codes SHALL be taken from DataAbsentReasonhttp://hl7.org/fhir/ValueSet/data-absent-reason
                  (extensible to http://hl7.org/fhir/ValueSet/data-absent-reason)

                  Codes specifying why the result (Observation.value[x]) is missing.

                  TypeCodeableConcept
                  Is Modifierfalse
                  Must Supporttrue
                  Summaryfalse
                  Requirements

                  For many results it is necessary to handle exceptional values in measurements.

                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  44. Observation.bodySite
                  Definition

                  Indicates the site on the subject's body where the observation was made (i.e. the target site).

                  ShortObserved body part
                  Comments

                  Only used if not implicit in code found in Observation.code. In many systems, this may be represented as a related observation instead of an inline component.

                  If the use case requires BodySite to be handled as a separate resource (e.g. to identify and track separately) then use the standard extension bodySite.


                  Only used if not implicit in code found in Observation.code. In many systems, this may be represented as a related observation instead of an inline component.

                  If the use case requires BodySite to be handled as a separate resource (e.g. to identify and track separately) then use the standard extension bodySite.

                  Control0..1
                  BindingFor example codes, see http://hl7.org/fhir/hspc/ValueSet/bpMeasBodyLocationPrecoordVShttp://hl7.org/fhir/ValueSet/body-site
                  (example to http://hl7.org/fhir/hspc/ValueSet/bpMeasBodyLocationPrecoordVS)
                  TypeCodeableConcept
                  Is Modifierfalse
                  Summaryfalse
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  46. Observation.method
                  Definition

                  Indicates the mechanism used to perform the observation.

                  ShortHow it was done
                  Comments

                  Only used if not implicit in code for Observation.code.

                  Control0..1
                  BindingFor example codes, see https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-bp-measurement-methodhttp://hl7.org/fhir/ValueSet/observation-methods
                  (example to https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-bp-measurement-method)
                  TypeCodeableConcept
                  Is Modifierfalse
                  Summaryfalse
                  Requirements

                  In some cases, method can impact results and is thus used for determining whether results can be compared or determining significance of results.

                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  48. Observation.component
                  Definition

                  Used when reporting systolic and diastolic blood pressure.


                  Some observations have multiple component observations. These component observations are expressed as separate code value pairs that share the same attributes. Examples include systolic and diastolic component observations for blood pressure measurement and multiple component observations for genetics observations.

                  ShortUsed when reporting systolic and diastolic blood pressure.Component results
                  Comments

                  For a discussion on the ways Observations can be assembled in groups together see Notes below.


                  For a discussion on the ways Observations can be assembled in groups together see Notes below.

                  Control20..*
                  TypeBackboneElement
                  Is Modifierfalse
                  Must Supporttrue
                  Summarytrue
                  Requirements

                  Component observations share the same attributes in the Observation resource as the primary observation and are always treated a part of a single observation (they are not separable). However, the reference range for the primary observation value is not inherited by the component values and is required when appropriate for each component observation.

                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  vs-3: If there is no a value a data absent reason must be present (value.exists() or dataAbsentReason.exists())
                  SlicingThis element introduces a set of slices on Observation.component. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                  • value @ code.coding.code
                  • value @ code.coding.system
                  • 50. Observation.component.modifierExtension
                    Definition

                    May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                    Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                    ShortExtensions that cannot be ignored even if unrecognized
                    Comments

                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                    Control0..*
                    TypeExtension
                    Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                    Summarytrue
                    Requirements

                    Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.


                    Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                    Alternate Namesextensions, user content, modifiers
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    52. Observation.component.code
                    Definition

                    Describes what was observed. Sometimes this is called the observation "code".

                    ShortType of component observation (code / type)
                    Comments

                    All code-value and component.code-component.value pairs need to be taken into account to correctly understand the meaning of the observation.

                    Control1..1
                    BindingUnless not suitable, these codes SHALL be taken from For example codes, see VitalSignshttp://hl7.org/fhir/ValueSet/observation-codes
                    (extensible to http://hl7.org/fhir/ValueSet/observation-vitalsignresult)

                    This identifies the vital sign result type.


                    Codes identifying names of simple observations.

                    TypeCodeableConcept
                    Is Modifierfalse
                    Must Supporttrue
                    Summarytrue
                    Requirements

                    Knowing what kind of observation is being made is essential to understanding the observation.

                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    54. Observation.component.value[x]
                    Definition

                    Vital Sign Value recorded with UCUM.


                    The information determined as a result of making the observation, if the information has a simple value.

                    ShortVital Sign Value recorded with UCUMActual component result
                    Comments

                    Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.


                    Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                    Control0..1
                    This element is affected by the following invariants: vs-3
                    BindingUnless not suitable, these codes SHALL be taken from For codes, see VitalSignsUnits
                    (extensible to http://hl7.org/fhir/ValueSet/ucum-vitals-common|4.0.1)

                    Common UCUM units for recording Vital Signs.

                    TypeChoice of: Quantity, CodeableConcept, string, boolean, integer, Range, Ratio, SampledData, time, dateTime, Period
                    [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                    Is Modifierfalse
                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                    Must Supporttrue
                    Must Support TypesNo must-support rules about the choice of types/profiles
                    Summarytrue
                    Requirements
                    1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).

                    An observation exists to have a value, though it might not if it is in error, or if it represents a group of observations.

                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    56. Observation.component.dataAbsentReason
                    Definition

                    Provides a reason why the expected value in the element Observation.component.value[x] is missing.

                    ShortWhy the component result is missing
                    Comments

                    "Null" or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "test not done".

                    The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Because of these options, use-case agreements are required to interpret general observations for exceptional values.

                    Control0..1
                    This element is affected by the following invariants: obs-6, vs-3
                    BindingUnless not suitable, these codes SHALL be taken from DataAbsentReasonhttp://hl7.org/fhir/ValueSet/data-absent-reason
                    (extensible to http://hl7.org/fhir/ValueSet/data-absent-reason)

                    Codes specifying why the result (Observation.value[x]) is missing.

                    TypeCodeableConcept
                    Is Modifierfalse
                    Must Supporttrue
                    Summaryfalse
                    Requirements

                    For many results it is necessary to handle exceptional values in measurements.

                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    58. Observation.component:SystolicBP
                    Slice NameSystolicBP
                    Definition

                    Used when reporting systolic and diastolic blood pressure.


                    Some observations have multiple component observations. These component observations are expressed as separate code value pairs that share the same attributes. Examples include systolic and diastolic component observations for blood pressure measurement and multiple component observations for genetics observations.

                    ShortUsed when reporting systolic and diastolic blood pressure.Component results
                    Comments

                    For a discussion on the ways Observations can be assembled in groups together see Notes below.


                    For a discussion on the ways Observations can be assembled in groups together see Notes below.

                    Control10..1*
                    TypeBackboneElement
                    Is Modifierfalse
                    Must Supporttrue
                    Summarytrue
                    Requirements

                    Component observations share the same attributes in the Observation resource as the primary observation and are always treated a part of a single observation (they are not separable). However, the reference range for the primary observation value is not inherited by the component values and is required when appropriate for each component observation.

                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    vs-3: If there is no a value a data absent reason must be present (value.exists() or dataAbsentReason.exists())
                    60. Observation.component:SystolicBP.modifierExtension
                    Definition

                    May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                    Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                    ShortExtensions that cannot be ignored even if unrecognized
                    Comments

                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                    Control0..*
                    TypeExtension
                    Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                    Summarytrue
                    Requirements

                    Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.


                    Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                    Alternate Namesextensions, user content, modifiers
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    62. Observation.component:SystolicBP.code
                    Definition

                    Describes what was observed. Sometimes this is called the observation "code".

                    ShortType of component observation (code / type)
                    Comments

                    additional codes that translate or map to this code are allowed. For example a more granular LOINC code or code that is used locally in a system.


                    All code-value and component.code-component.value pairs need to be taken into account to correctly understand the meaning of the observation.

                    Control1..1
                    BindingUnless not suitable, these codes SHALL be taken from For example codes, see VitalSignshttp://hl7.org/fhir/ValueSet/observation-codes
                    (extensible to http://hl7.org/fhir/ValueSet/observation-vitalsignresult)

                    This identifies the vital sign result type.


                    Codes identifying names of simple observations.

                    TypeCodeableConcept
                    Is Modifierfalse
                    Must Supporttrue
                    Summarytrue
                    Requirements

                    Knowing what kind of observation is being made is essential to understanding the observation.

                    Alternate NamesComponent Test, Component Name
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    64. Observation.component:SystolicBP.code.coding
                    Definition

                    Systolic Blood Pressure.


                    A reference to a code defined by a terminology system.

                    ShortSystolic Blood PressureCode defined by a terminology system
                    Comments

                    Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                    Control10..*
                    TypeCoding
                    Is Modifierfalse
                    Summarytrue
                    Requirements

                    Allows for alternative encodings within a code system, and translations to other code systems.

                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    SlicingThis element introduces a set of slices on Observation.component.code.coding. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                    • value @ code
                    • value @ system
                    • 66. Observation.component:SystolicBP.code.coding:SBPCode
                      Slice NameSBPCode
                      Definition

                      Systolic Blood Pressure.


                      A reference to a code defined by a terminology system.

                      ShortSystolic Blood PressureCode defined by a terminology system
                      Comments

                      Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                      Control10..1*
                      TypeCoding
                      Is Modifierfalse
                      Summarytrue
                      Requirements

                      Allows for alternative encodings within a code system, and translations to other code systems.

                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                      68. Observation.component:SystolicBP.code.coding:SBPCode.system
                      Definition

                      The identification of the code system that defines the meaning of the symbol in the code.

                      ShortIdentity of the terminology system
                      Comments

                      The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.

                      Control10..1
                      Typeuri
                      Is Modifierfalse
                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                      Summarytrue
                      Requirements

                      Need to be unambiguous about the source of the definition of the symbol.

                      Fixed Valuehttp://loinc.org
                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                      70. Observation.component:SystolicBP.code.coding:SBPCode.code
                      Definition

                      A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).

                      ShortSymbol in syntax defined by the system
                      Control10..1
                      Typecode
                      Is Modifierfalse
                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                      Summarytrue
                      Requirements

                      Need to refer to a particular code in the system.

                      Fixed Value8480-6
                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                      72. Observation.component:SystolicBP.value[x]
                      Definition

                      Vital Sign Value recorded with UCUM.


                      The information determined as a result of making the observation, if the information has a simple value.

                      ShortVital Sign Value recorded with UCUMActual component result
                      Comments

                      Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.


                      Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                      Control0..1
                      This element is affected by the following invariants: vs-3
                      BindingUnless not suitable, these codes SHALL be taken from For codes, see VitalSignsUnits
                      (extensible to http://hl7.org/fhir/ValueSet/ucum-vitals-common|4.0.1)

                      Common UCUM units for recording Vital Signs.

                      TypeQuantity, dateTime, boolean, string, SampledData, Period, Ratio, integer, time, Range, CodeableConcept
                      [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                      Is Modifierfalse
                      Must Supporttrue
                      Summarytrue
                      Requirements
                      1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).

                      An observation exists to have a value, though it might not if it is in error, or if it represents a group of observations.

                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                      SlicingThis element introduces a set of slices on Observation.component.value[x]. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                      • type @ $this
                      • 74. Observation.component:SystolicBP.value[x].value
                        Definition

                        The value of the measured amount. The value includes an implicit precision in the presentation of the value.

                        ShortNumerical value (with implicit precision)
                        Comments

                        The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).

                        Control10..1
                        Typedecimal
                        Is Modifierfalse
                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                        Must Supporttrue
                        Summarytrue
                        Requirements

                        Precision is handled implicitly in almost all cases of measurement.

                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        76. Observation.component:SystolicBP.value[x].comparator
                        Definition

                        How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.

                        Short< | <= | >= | > - how to understand the value
                        Control0..1
                        BindingThe codes SHALL be taken from QuantityComparatorhttp://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1
                        (required to http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1)

                        How the Quantity should be understood and represented.

                        Typecode
                        Is Modifiertrue because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                        Summarytrue
                        Requirements

                        Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

                        Meaning if MissingIf there is no comparator, then there is no modification of the value
                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        78. Observation.component:SystolicBP.value[x].unit
                        Definition

                        A human-readable form of the unit.

                        ShortUnit representation
                        Control10..1
                        Typestring
                        Is Modifierfalse
                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                        Must Supporttrue
                        Summarytrue
                        Requirements

                        There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.

                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        80. Observation.component:SystolicBP.value[x].system
                        Definition

                        The identification of the system that provides the coded form of the unit.

                        ShortSystem that defines coded unit form
                        Control10..1
                        This element is affected by the following invariants: qty-3
                        Typeuri
                        Is Modifierfalse
                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                        Must Supporttrue
                        Summarytrue
                        Requirements

                        Need to know the system that defines the coded form of the unit.

                        Fixed Valuehttp://unitsofmeasure.org
                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        82. Observation.component:SystolicBP.value[x].code
                        Definition

                        Coded responses from the common UCUM units for vital signs value set.


                        A computer processable form of the unit in some unit representation system.

                        ShortCoded responses from the common UCUM units for vital signs value set.Coded form of the unit
                        Comments

                        The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.

                        Control10..1
                        Typecode
                        Is Modifierfalse
                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                        Must Supporttrue
                        Summarytrue
                        Requirements

                        Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.

                        Fixed Valuemm[Hg]
                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        84. Observation.component:SystolicBP.dataAbsentReason
                        Definition

                        Provides a reason why the expected value in the element Observation.component.value[x] is missing.

                        ShortWhy the component result is missing
                        Comments

                        "Null" or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "test not done".

                        The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Because of these options, use-case agreements are required to interpret general observations for exceptional values.

                        Control0..1
                        This element is affected by the following invariants: obs-6, vs-3
                        BindingUnless not suitable, these codes SHALL be taken from DataAbsentReasonhttp://hl7.org/fhir/ValueSet/data-absent-reason
                        (extensible to http://hl7.org/fhir/ValueSet/data-absent-reason)

                        Codes specifying why the result (Observation.value[x]) is missing.

                        TypeCodeableConcept
                        Is Modifierfalse
                        Must Supporttrue
                        Summaryfalse
                        Requirements

                        For many results it is necessary to handle exceptional values in measurements.

                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        86. Observation.component:SystolicBP.referenceRange
                        Definition

                        Guidance on how to interpret the value by comparison to a normal or recommended range.

                        ShortProvides guide for interpretation of component result
                        Comments

                        Most observations only have one generic reference range. Systems MAY choose to restrict to only supplying the relevant reference range based on knowledge about the patient (e.g., specific to the patient's age, gender, weight and other factors), but this might not be possible or appropriate. Whenever more than one reference range is supplied, the differences between them SHOULD be provided in the reference range and/or age properties.

                        Control0..*
                        TypeSeettp://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange
                        Is Modifierfalse
                        Summaryfalse
                        Requirements

                        Knowing what values are considered "normal" can help evaluate the significance of a particular result. Need to be able to provide multiple reference ranges for different contexts.

                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        88. Observation.component:DiastolicBP
                        Slice NameDiastolicBP
                        Definition

                        Used when reporting diastolic blood pressure.


                        Some observations have multiple component observations. These component observations are expressed as separate code value pairs that share the same attributes. Examples include systolic and diastolic component observations for blood pressure measurement and multiple component observations for genetics observations.

                        ShortUsed when reporting diastolic blood pressure.Component results
                        Comments

                        For a discussion on the ways Observations can be assembled in groups together see Notes below.


                        For a discussion on the ways Observations can be assembled in groups together see Notes below.

                        Control10..1*
                        TypeBackboneElement
                        Is Modifierfalse
                        Must Supporttrue
                        Summarytrue
                        Requirements

                        Component observations share the same attributes in the Observation resource as the primary observation and are always treated a part of a single observation (they are not separable). However, the reference range for the primary observation value is not inherited by the component values and is required when appropriate for each component observation.

                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        vs-3: If there is no a value a data absent reason must be present (value.exists() or dataAbsentReason.exists())
                        90. Observation.component:DiastolicBP.modifierExtension
                        Definition

                        May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                        Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                        ShortExtensions that cannot be ignored even if unrecognized
                        Comments

                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                        Control0..*
                        TypeExtension
                        Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                        Summarytrue
                        Requirements

                        Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.


                        Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                        Alternate Namesextensions, user content, modifiers
                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                        92. Observation.component:DiastolicBP.code
                        Definition

                        Describes what was observed. Sometimes this is called the observation "code".

                        ShortType of component observation (code / type)
                        Comments

                        additional codes that translate or map to this code are allowed. For example a more granular LOINC code or code that is used locally in a system.


                        All code-value and component.code-component.value pairs need to be taken into account to correctly understand the meaning of the observation.

                        Control1..1
                        BindingUnless not suitable, these codes SHALL be taken from For example codes, see VitalSignshttp://hl7.org/fhir/ValueSet/observation-codes
                        (extensible to http://hl7.org/fhir/ValueSet/observation-vitalsignresult)

                        This identifies the vital sign result type.


                        Codes identifying names of simple observations.

                        TypeCodeableConcept
                        Is Modifierfalse
                        Must Supporttrue
                        Summarytrue
                        Requirements

                        Knowing what kind of observation is being made is essential to understanding the observation.

                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        94. Observation.component:DiastolicBP.code.coding
                        Definition

                        Diastolic Blood Pressure.


                        A reference to a code defined by a terminology system.

                        ShortDiastolic Blood PressureCode defined by a terminology system
                        Comments

                        Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                        Control10..*
                        TypeCoding
                        Is Modifierfalse
                        Summarytrue
                        Requirements

                        Allows for alternative encodings within a code system, and translations to other code systems.

                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        SlicingThis element introduces a set of slices on Observation.component.code.coding. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                        • value @ code
                        • value @ system
                        • 96. Observation.component:DiastolicBP.code.coding:DBPCode
                          Slice NameDBPCode
                          Definition

                          Diastolic Blood Pressure.


                          A reference to a code defined by a terminology system.

                          ShortDiastolic Blood PressureCode defined by a terminology system
                          Comments

                          Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                          Control10..1*
                          TypeCoding
                          Is Modifierfalse
                          Summarytrue
                          Requirements

                          Allows for alternative encodings within a code system, and translations to other code systems.

                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                          98. Observation.component:DiastolicBP.code.coding:DBPCode.system
                          Definition

                          The identification of the code system that defines the meaning of the symbol in the code.

                          ShortIdentity of the terminology system
                          Comments

                          The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.

                          Control10..1
                          Typeuri
                          Is Modifierfalse
                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                          Summarytrue
                          Requirements

                          Need to be unambiguous about the source of the definition of the symbol.

                          Fixed Valuehttp://loinc.org
                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                          100. Observation.component:DiastolicBP.code.coding:DBPCode.code
                          Definition

                          A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).

                          ShortSymbol in syntax defined by the system
                          Control10..1
                          Typecode
                          Is Modifierfalse
                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                          Summarytrue
                          Requirements

                          Need to refer to a particular code in the system.

                          Fixed Value8462-4
                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                          102. Observation.component:DiastolicBP.value[x]
                          Definition

                          Vital Sign Value recorded with UCUM.


                          The information determined as a result of making the observation, if the information has a simple value.

                          ShortVital Sign Value recorded with UCUMActual component result
                          Comments

                          Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.


                          Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                          Control0..1
                          This element is affected by the following invariants: vs-3
                          BindingUnless not suitable, these codes SHALL be taken from For codes, see VitalSignsUnits
                          (extensible to http://hl7.org/fhir/ValueSet/ucum-vitals-common|4.0.1)

                          Common UCUM units for recording Vital Signs.

                          TypeQuantity, dateTime, boolean, string, SampledData, Period, Ratio, integer, time, Range, CodeableConcept
                          [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                          Is Modifierfalse
                          Must Supporttrue
                          Summarytrue
                          Requirements
                          1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).

                          An observation exists to have a value, though it might not if it is in error, or if it represents a group of observations.

                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                          SlicingThis element introduces a set of slices on Observation.component.value[x]. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                          • type @ $this
                          • 104. Observation.component:DiastolicBP.value[x].value
                            Definition

                            The value of the measured amount. The value includes an implicit precision in the presentation of the value.

                            ShortNumerical value (with implicit precision)
                            Comments

                            The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).

                            Control10..1
                            Typedecimal
                            Is Modifierfalse
                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                            Must Supporttrue
                            Summarytrue
                            Requirements

                            Precision is handled implicitly in almost all cases of measurement.

                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            106. Observation.component:DiastolicBP.value[x].comparator
                            Definition

                            How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.

                            Short< | <= | >= | > - how to understand the value
                            Control0..1
                            BindingThe codes SHALL be taken from QuantityComparatorhttp://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1
                            (required to http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1)

                            How the Quantity should be understood and represented.

                            Typecode
                            Is Modifiertrue because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                            Summarytrue
                            Requirements

                            Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

                            Meaning if MissingIf there is no comparator, then there is no modification of the value
                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            108. Observation.component:DiastolicBP.value[x].unit
                            Definition

                            A human-readable form of the unit.

                            ShortUnit representation
                            Control10..1
                            Typestring
                            Is Modifierfalse
                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                            Must Supporttrue
                            Summarytrue
                            Requirements

                            There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.

                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            110. Observation.component:DiastolicBP.value[x].system
                            Definition

                            The identification of the system that provides the coded form of the unit.

                            ShortSystem that defines coded unit form
                            Control10..1
                            This element is affected by the following invariants: qty-3
                            Typeuri
                            Is Modifierfalse
                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                            Must Supporttrue
                            Summarytrue
                            Requirements

                            Need to know the system that defines the coded form of the unit.

                            Fixed Valuehttp://unitsofmeasure.org
                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            112. Observation.component:DiastolicBP.value[x].code
                            Definition

                            Coded responses from the common UCUM units for vital signs value set.


                            A computer processable form of the unit in some unit representation system.

                            ShortCoded responses from the common UCUM units for vital signs value set.Coded form of the unit
                            Comments

                            The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.

                            Control10..1
                            Typecode
                            Is Modifierfalse
                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                            Must Supporttrue
                            Summarytrue
                            Requirements

                            Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.

                            Fixed Valuemm[Hg]
                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            114. Observation.component:DiastolicBP.dataAbsentReason
                            Definition

                            Provides a reason why the expected value in the element Observation.component.value[x] is missing.

                            ShortWhy the component result is missing
                            Comments

                            "Null" or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "test not done".

                            The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Because of these options, use-case agreements are required to interpret general observations for exceptional values.

                            Control0..1
                            This element is affected by the following invariants: obs-6, vs-3
                            BindingUnless not suitable, these codes SHALL be taken from DataAbsentReasonhttp://hl7.org/fhir/ValueSet/data-absent-reason
                            (extensible to http://hl7.org/fhir/ValueSet/data-absent-reason)

                            Codes specifying why the result (Observation.value[x]) is missing.

                            TypeCodeableConcept
                            Is Modifierfalse
                            Must Supporttrue
                            Summaryfalse
                            Requirements

                            For many results it is necessary to handle exceptional values in measurements.

                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            116. Observation.component:DiastolicBP.referenceRange
                            Definition

                            Guidance on how to interpret the value by comparison to a normal or recommended range.

                            ShortProvides guide for interpretation of component result
                            Comments

                            Most observations only have one generic reference range. Systems MAY choose to restrict to only supplying the relevant reference range based on knowledge about the patient (e.g., specific to the patient's age, gender, weight and other factors), but this might not be possible or appropriate. Whenever more than one reference range is supplied, the differences between them SHOULD be provided in the reference range and/or age properties.

                            Control0..*
                            TypeSeettp://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange
                            Is Modifierfalse
                            Summaryfalse
                            Requirements

                            Knowing what values are considered "normal" can help evaluate the significance of a particular result. Need to be able to provide multiple reference ranges for different contexts.

                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            118. Observation.component:MeanBP
                            Slice NameMeanBP
                            Definition

                            Mean blood pressure


                            Some observations have multiple component observations. These component observations are expressed as separate code value pairs that share the same attributes. Examples include systolic and diastolic component observations for blood pressure measurement and multiple component observations for genetics observations.

                            ShortMean blood pressureComponent results
                            Comments

                            For a discussion on the ways Observations can be assembled in groups together see Notes below.


                            For a discussion on the ways Observations can be assembled in groups together see Notes below.

                            Control0..1*
                            TypeBackboneElement
                            Is Modifierfalse
                            Must Supporttrue
                            Summarytrue
                            Requirements

                            Component observations share the same attributes in the Observation resource as the primary observation and are always treated a part of a single observation (they are not separable). However, the reference range for the primary observation value is not inherited by the component values and is required when appropriate for each component observation.

                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            vs-3: If there is no a value a data absent reason must be present (value.exists() or dataAbsentReason.exists())
                            120. Observation.component:MeanBP.modifierExtension
                            Definition

                            May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                            Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                            ShortExtensions that cannot be ignored even if unrecognized
                            Comments

                            There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                            Control0..*
                            TypeExtension
                            Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                            Summarytrue
                            Requirements

                            Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.


                            Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                            Alternate Namesextensions, user content, modifiers
                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                            122. Observation.component:MeanBP.code
                            Definition

                            Describes what was observed. Sometimes this is called the observation "code".

                            ShortType of component observation (code / type)
                            Comments

                            All code-value and component.code-component.value pairs need to be taken into account to correctly understand the meaning of the observation.

                            Control1..1
                            BindingUnless not suitable, these codes SHALL be taken from For example codes, see VitalSignshttp://hl7.org/fhir/ValueSet/observation-codes
                            (extensible to http://hl7.org/fhir/ValueSet/observation-vitalsignresult)

                            This identifies the vital sign result type.


                            Codes identifying names of simple observations.

                            TypeCodeableConcept
                            Is Modifierfalse
                            Must Supporttrue
                            Summarytrue
                            Requirements

                            Knowing what kind of observation is being made is essential to understanding the observation.

                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            124. Observation.component:MeanBP.code.coding
                            Definition

                            A reference to a code defined by a terminology system.

                            ShortCode defined by a terminology system
                            Comments

                            Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                            Control10..*
                            TypeCoding
                            Is Modifierfalse
                            Summarytrue
                            Requirements

                            Allows for alternative encodings within a code system, and translations to other code systems.

                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            SlicingThis element introduces a set of slices on Observation.component.code.coding. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                            • value @ code
                            • value @ system
                            • 126. Observation.component:MeanBP.code.coding:MBPCode
                              Slice NameMBPCode
                              Definition

                              A reference to a code defined by a terminology system.

                              ShortCode defined by a terminology system
                              Comments

                              Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                              Control10..1*
                              TypeCoding
                              Is Modifierfalse
                              Summarytrue
                              Requirements

                              Allows for alternative encodings within a code system, and translations to other code systems.

                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              128. Observation.component:MeanBP.code.coding:MBPCode.system
                              Definition

                              The identification of the code system that defines the meaning of the symbol in the code.

                              ShortIdentity of the terminology system
                              Comments

                              The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.

                              Control10..1
                              Typeuri
                              Is Modifierfalse
                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                              Summarytrue
                              Requirements

                              Need to be unambiguous about the source of the definition of the symbol.

                              Fixed Valuehttp://loinc.org
                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              130. Observation.component:MeanBP.code.coding:MBPCode.code
                              Definition

                              Mean blood pressure


                              A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).

                              ShortMean blood pressureSymbol in syntax defined by the system
                              Control10..1
                              Typecode
                              Is Modifierfalse
                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                              Summarytrue
                              Requirements

                              Need to refer to a particular code in the system.

                              Fixed Value8478-0
                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              132. Observation.component:MeanBP.value[x]
                              Definition

                              Vital Sign Value recorded with UCUM.


                              The information determined as a result of making the observation, if the information has a simple value.

                              ShortVital Sign Value recorded with UCUMActual component result
                              Comments

                              Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.


                              Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                              Control0..1
                              This element is affected by the following invariants: vs-3
                              BindingUnless not suitable, these codes SHALL be taken from For codes, see VitalSignsUnits
                              (extensible to http://hl7.org/fhir/ValueSet/ucum-vitals-common|4.0.1)

                              Common UCUM units for recording Vital Signs.

                              TypeChoice of: Quantity, CodeableConcept, string, boolean, integer, Range, Ratio, SampledData, time, dateTime, Period
                              [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                              Is Modifierfalse
                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                              Must Supporttrue
                              Must Support TypesNo must-support rules about the choice of types/profiles
                              Summarytrue
                              Requirements
                              1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).

                              An observation exists to have a value, though it might not if it is in error, or if it represents a group of observations.

                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              134. Observation.component:MeanBP.dataAbsentReason
                              Definition

                              Provides a reason why the expected value in the element Observation.component.value[x] is missing.

                              ShortWhy the component result is missing
                              Comments

                              "Null" or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "test not done".

                              The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Because of these options, use-case agreements are required to interpret general observations for exceptional values.

                              Control0..1
                              This element is affected by the following invariants: obs-6, vs-3
                              BindingUnless not suitable, these codes SHALL be taken from DataAbsentReasonhttp://hl7.org/fhir/ValueSet/data-absent-reason
                              (extensible to http://hl7.org/fhir/ValueSet/data-absent-reason)

                              Codes specifying why the result (Observation.value[x]) is missing.

                              TypeCodeableConcept
                              Is Modifierfalse
                              Must Supporttrue
                              Summaryfalse
                              Requirements

                              For many results it is necessary to handle exceptional values in measurements.

                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              136. Observation.component:MeanBP.referenceRange
                              Definition

                              Guidance on how to interpret the value by comparison to a normal or recommended range.

                              ShortProvides guide for interpretation of component result
                              Comments

                              Most observations only have one generic reference range. Systems MAY choose to restrict to only supplying the relevant reference range based on knowledge about the patient (e.g., specific to the patient's age, gender, weight and other factors), but this might not be possible or appropriate. Whenever more than one reference range is supplied, the differences between them SHOULD be provided in the reference range and/or age properties.

                              Control0..*
                              TypeSeettp://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange
                              Is Modifierfalse
                              Summaryfalse
                              Requirements

                              Knowing what values are considered "normal" can help evaluate the significance of a particular result. Need to be able to provide multiple reference ranges for different contexts.

                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))

                              Guidance on how to interpret the contents of this table can be found here

                              0. Observation
                              Definition

                              This profile defines how to represent Blood Pressure observations in FHIR using a standard LOINC code and UCUM units of measure. This is a grouping structure. It has no value in Observation.valueQuantity but contains at least one component (systolic and/or diastolic).

                              ShortFHIR Blood Pressure Profile
                              Comments

                              Used for simple observations such as device measurements, laboratory atomic results, vital signs, height, weight, smoking status, comments, etc. Other resources are used to provide context for observations such as laboratory reports, etc.

                              Control0..*
                              Is Modifierfalse
                              Summaryfalse
                              Alternate NamesVital Signs, Measurement, Results, Tests
                              Invariantsdom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources (contained.contained.empty())
                              dom-3: If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource (contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty())
                              dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated (contained.meta.versionId.empty() and contained.meta.lastUpdated.empty())
                              dom-5: If a resource is contained in another resource, it SHALL NOT have a security label (contained.meta.security.empty())
                              dom-6: A resource should have narrative for robust management (text.`div`.exists())
                              obs-6: dataAbsentReason SHALL only be present if Observation.value[x] is not present (dataAbsentReason.empty() or value.empty())
                              obs-7: If Observation.code is the same as an Observation.component.code then the value element associated with the code SHALL NOT be present (value.empty() or component.code.where(coding.intersect(%resource.code.coding).exists()).empty())
                              vs-2: If there is no component or hasMember element then either a value[x] or a data absent reason must be present. ((component.empty() and hasMember.empty()) implies (dataAbsentReason.exists() or value.exists()))
                              2. Observation.id
                              Definition

                              The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes.

                              ShortLogical id of this artifact
                              Comments

                              The only time that a resource does not have an id is when it is being submitted to the server using a create operation.

                              Control0..1
                              Typeid
                              Is Modifierfalse
                              Summarytrue
                              4. Observation.meta
                              Definition

                              The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content might not always be associated with version changes to the resource.

                              ShortMetadata about the resource
                              Control0..1
                              TypeMeta
                              Is Modifierfalse
                              Summarytrue
                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              6. Observation.meta.id
                              Definition

                              Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                              ShortUnique id for inter-element referencing
                              Control0..1
                              Typestring
                              Is Modifierfalse
                              XML FormatIn the XML format, this property is represented as an attribute.
                              Summaryfalse
                              8. Observation.meta.extension
                              Definition

                              May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                              ShortAdditional content defined by implementations
                              Comments

                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                              Control0..*
                              TypeExtension
                              Is Modifierfalse
                              Summaryfalse
                              Alternate Namesextensions, user content
                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                              SlicingThis element introduces a set of slices on Observation.meta.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                              • value @ url
                              • 10. Observation.meta.versionId
                                Definition

                                The version specific identifier, as it appears in the version portion of the URL. This value changes when the resource is created, updated, or deleted.

                                ShortVersion specific identifier
                                Comments

                                The server assigns this value, and ignores what the client specifies, except in the case that the server is imposing version integrity on updates/deletes.

                                Control0..1
                                Typeid
                                Is Modifierfalse
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                12. Observation.meta.lastUpdated
                                Definition

                                When the resource last changed - e.g. when the version changed.

                                ShortWhen the resource version last changed
                                Comments

                                This value is always populated except when the resource is first being created. The server / resource manager sets this value; what a client provides is irrelevant. This is equivalent to the HTTP Last-Modified and SHOULD have the same value on a read interaction.

                                Control0..1
                                Typeinstant
                                Is Modifierfalse
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                14. Observation.meta.source
                                Definition

                                A uri that identifies the source system of the resource. This provides a minimal amount of Provenance information that can be used to track or differentiate the source of information in the resource. The source may identify another FHIR server, document, message, database, etc.

                                ShortIdentifies where the resource comes from
                                Comments

                                In the provenance resource, this corresponds to Provenance.entity.what[x]. The exact use of the source (and the implied Provenance.entity.role) is left to implementer discretion. Only one nominated source is allowed; for additional provenance details, a full Provenance resource should be used.

                                This element can be used to indicate where the current master source of a resource that has a canonical URL if the resource is no longer hosted at the canonical URL.

                                Control0..1
                                Typeuri
                                Is Modifierfalse
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                16. Observation.meta.profile
                                Definition

                                A list of profiles (references to StructureDefinition resources) that this resource claims to conform to. The URL is a reference to StructureDefinition.url.

                                ShortProfiles this resource claims to conform to
                                Comments

                                It is up to the server and/or other infrastructure of policy to determine whether/how these claims are verified and/or updated over time. The list of profile URLs is a set.

                                Control0..*
                                Typecanonical(StructureDefinition)
                                Is Modifierfalse
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Summarytrue
                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                SlicingThis element introduces a set of slices on Observation.meta.profile. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                • value @ $this
                                • 18. Observation.meta.profile:fr-canonical
                                  Slice Namefr-canonical
                                  Definition

                                  A list of profiles (references to StructureDefinition resources) that this resource claims to conform to. The URL is a reference to StructureDefinition.url.

                                  ShortProfiles this resource claims to conform to
                                  Comments

                                  It is up to the server and/or other infrastructure of policy to determine whether/how these claims are verified and/or updated over time. The list of profile URLs is a set.

                                  Control0..1
                                  Typecanonical(StructureDefinition)
                                  Is Modifierfalse
                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                  Summarytrue
                                  Pattern Valuehttps://hl7.fr/ig/fhir/core/StructureDefinition/fr-core-observation-bp
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  20. Observation.meta.security
                                  Definition

                                  Security labels applied to this resource. These tags connect specific resources to the overall security policy and infrastructure.

                                  ShortSecurity Labels applied to this resource
                                  Comments

                                  The security labels can be updated without changing the stated version of the resource. The list of security labels is a set. Uniqueness is based the system/code, and version and display are ignored.

                                  Control0..*
                                  BindingUnless not suitable, these codes SHALL be taken from All Security Labels
                                  (extensible to http://hl7.org/fhir/ValueSet/security-labels)

                                  Security Labels from the Healthcare Privacy and Security Classification System.

                                  TypeCoding
                                  Is Modifierfalse
                                  Summarytrue
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  22. Observation.meta.tag
                                  Definition

                                  Tags applied to this resource. Tags are intended to be used to identify and relate resources to process and workflow, and applications are not required to consider the tags when interpreting the meaning of a resource.

                                  ShortTags applied to this resource
                                  Comments

                                  The tags can be updated without changing the stated version of the resource. The list of tags is a set. Uniqueness is based the system/code, and version and display are ignored.

                                  Control0..*
                                  BindingFor example codes, see CommonTags
                                  (example to http://hl7.org/fhir/ValueSet/common-tags)

                                  Codes that represent various types of tags, commonly workflow-related; e.g. "Needs review by Dr. Jones".

                                  TypeCoding
                                  Is Modifierfalse
                                  Summarytrue
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  24. Observation.implicitRules
                                  Definition

                                  A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc.

                                  ShortA set of rules under which this content was created
                                  Comments

                                  Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc.

                                  Control0..1
                                  Typeuri
                                  Is Modifiertrue because This element is labeled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation
                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                  Summarytrue
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  26. Observation.language
                                  Definition

                                  The base language in which the resource is written.

                                  ShortLanguage of the resource content
                                  Comments

                                  Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource. Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute).

                                  Control0..1
                                  BindingThe codes SHOULD be taken from CommonLanguages
                                  (preferred to http://hl7.org/fhir/ValueSet/languages)

                                  A human language.

                                  Additional BindingsPurpose
                                  AllLanguagesMax Binding
                                  Typecode
                                  Is Modifierfalse
                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                  Summaryfalse
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  28. Observation.text
                                  Definition

                                  A human-readable narrative that contains a summary of the resource and can be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety.

                                  ShortText summary of the resource, for human interpretation
                                  Comments

                                  Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded information is added later.

                                  Control0..1
                                  TypeNarrative
                                  Is Modifierfalse
                                  Summaryfalse
                                  Alternate Namesnarrative, html, xhtml, display
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  30. Observation.contained
                                  Definition

                                  These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope.

                                  ShortContained, inline Resources
                                  Comments

                                  This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again. Contained resources may have profiles and tags In their meta elements, but SHALL NOT have security labels.

                                  Control0..*
                                  TypeResource
                                  Is Modifierfalse
                                  Summaryfalse
                                  Alternate Namesinline resources, anonymous resources, contained resources
                                  32. Observation.extension
                                  Definition

                                  An Extension

                                  ShortExtension
                                  Control0..*
                                  TypeExtension
                                  Is Modifierfalse
                                  Summaryfalse
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                  SlicingThis element introduces a set of slices on Observation.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                  • value @ url
                                  • 34. Observation.extension:supportingInfo
                                    Slice NamesupportingInfo
                                    Definition

                                    Other resources from the patient record that may be relevant to the event. The information from these resources was either used to create the instance or is provided to help with its interpretation. This extension should not be used if more specific inline elements or extensions are available. For example, use Observation.hasMember instead of supportingInformation for representing the members of an Observation panel.

                                    ShortOther information that may be relevant to this event.
                                    Control0..1
                                    TypeExtension(Supporting info) (Extension Type: Reference(Resource))
                                    Is Modifierfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    36. Observation.modifierExtension
                                    Definition

                                    May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                    Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                    ShortExtensions that cannot be ignored
                                    Comments

                                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                    Control0..*
                                    TypeExtension
                                    Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the resource that contains them
                                    Summaryfalse
                                    Requirements

                                    Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                    Alternate Namesextensions, user content
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    38. Observation.identifier
                                    Definition

                                    A unique identifier assigned to this observation.

                                    ShortBusiness Identifier for observation
                                    NoteThis is a business identifier, not a resource identifier (see discussion)
                                    Control0..*
                                    TypeIdentifier
                                    Is Modifierfalse
                                    Summarytrue
                                    Requirements

                                    Allows observations to be distinguished and referenced.

                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    40. Observation.basedOn
                                    Definition

                                    A plan, proposal or order that is fulfilled in whole or in part by this event. For example, a MedicationRequest may require a patient to have laboratory test performed before it is dispensed.

                                    ShortFulfills plan, proposal or order
                                    Control0..*
                                    TypeReference(CarePlan, DeviceRequest, ImmunizationRecommendation, MedicationRequest, NutritionOrder, ServiceRequest)
                                    Is Modifierfalse
                                    Summarytrue
                                    Requirements

                                    Allows tracing of authorization for the event and tracking whether proposals/recommendations were acted upon.

                                    Alternate NamesFulfills
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    42. Observation.partOf
                                    Definition

                                    A larger event of which this particular Observation is a component or step. For example, an observation as part of a procedure.

                                    ShortPart of referenced event
                                    Comments

                                    To link an Observation to an Encounter use encounter. See the Notes below for guidance on referencing another Observation.

                                    Control0..*
                                    TypeReference(MedicationAdministration, MedicationDispense, MedicationStatement, Procedure, Immunization, ImagingStudy)
                                    Is Modifierfalse
                                    Summarytrue
                                    Alternate NamesContainer
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    44. Observation.status
                                    Definition

                                    The status of the result value.

                                    Shortregistered | preliminary | final | amended +
                                    Comments

                                    This element is labeled as a modifier because the status contains codes that mark the resource as not currently valid.

                                    Control1..1
                                    BindingThe codes SHALL be taken from ObservationStatus
                                    (required to http://hl7.org/fhir/ValueSet/observation-status|4.0.1)
                                    Typecode
                                    Is Modifiertrue because This element is labeled as a modifier because it is a status element that contains status entered-in-error which means that the resource should not be treated as valid
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Must Supporttrue
                                    Summarytrue
                                    Requirements

                                    Need to track the status of individual results. Some results are finalized before the whole report is finalized.

                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    46. Observation.category
                                    Definition

                                    A code that classifies the general type of observation being made.

                                    ShortClassification of type of observation
                                    Comments

                                    In addition to the required category valueset, this element allows various categorization schemes based on the owner’s definition of the category and effectively multiple categories can be used at once. The level of granularity is defined by the category concepts in the value set.

                                    Control1..*
                                    BindingThe codes SHOULD be taken from ObservationCategoryCodes
                                    (preferred to http://hl7.org/fhir/ValueSet/observation-category)

                                    Codes for high level observation categories.

                                    TypeCodeableConcept
                                    Is Modifierfalse
                                    Must Supporttrue
                                    Summaryfalse
                                    Requirements

                                    Used for filtering what observations are retrieved and displayed.

                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    SlicingThis element introduces a set of slices on Observation.category. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                    • value @ coding.code
                                    • value @ coding.system
                                    • 48. Observation.category:VSCat
                                      Slice NameVSCat
                                      Definition

                                      A code that classifies the general type of observation being made.

                                      ShortClassification of type of observation
                                      Comments

                                      In addition to the required category valueset, this element allows various categorization schemes based on the owner’s definition of the category and effectively multiple categories can be used at once. The level of granularity is defined by the category concepts in the value set.

                                      Control1..1
                                      BindingThe codes SHOULD be taken from ObservationCategoryCodes
                                      (preferred to http://hl7.org/fhir/ValueSet/observation-category)

                                      Codes for high level observation categories.

                                      TypeCodeableConcept
                                      Is Modifierfalse
                                      Must Supporttrue
                                      Summaryfalse
                                      Requirements

                                      Used for filtering what observations are retrieved and displayed.

                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                      50. Observation.category:VSCat.id
                                      Definition

                                      Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                      ShortUnique id for inter-element referencing
                                      Control0..1
                                      Typestring
                                      Is Modifierfalse
                                      XML FormatIn the XML format, this property is represented as an attribute.
                                      Summaryfalse
                                      52. Observation.category:VSCat.extension
                                      Definition

                                      May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                      ShortAdditional content defined by implementations
                                      Comments

                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                      Control0..*
                                      TypeExtension
                                      Is Modifierfalse
                                      Summaryfalse
                                      Alternate Namesextensions, user content
                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                      SlicingThis element introduces a set of slices on Observation.category.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                      • value @ url
                                      • 54. Observation.category:VSCat.coding
                                        Definition

                                        A reference to a code defined by a terminology system.

                                        ShortCode defined by a terminology system
                                        Comments

                                        Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                                        Control1..*
                                        TypeCoding
                                        Is Modifierfalse
                                        Must Supporttrue
                                        Summarytrue
                                        Requirements

                                        Allows for alternative encodings within a code system, and translations to other code systems.

                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                        56. Observation.category:VSCat.coding.id
                                        Definition

                                        Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                        ShortUnique id for inter-element referencing
                                        Control0..1
                                        Typestring
                                        Is Modifierfalse
                                        XML FormatIn the XML format, this property is represented as an attribute.
                                        Summaryfalse
                                        58. Observation.category:VSCat.coding.extension
                                        Definition

                                        May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                        ShortAdditional content defined by implementations
                                        Comments

                                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                        Control0..*
                                        TypeExtension
                                        Is Modifierfalse
                                        Summaryfalse
                                        Alternate Namesextensions, user content
                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                        SlicingThis element introduces a set of slices on Observation.category.coding.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                        • value @ url
                                        • 60. Observation.category:VSCat.coding.system
                                          Definition

                                          The identification of the code system that defines the meaning of the symbol in the code.

                                          ShortIdentity of the terminology system
                                          Comments

                                          The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.

                                          Control1..1
                                          Typeuri
                                          Is Modifierfalse
                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                          Must Supporttrue
                                          Summarytrue
                                          Requirements

                                          Need to be unambiguous about the source of the definition of the symbol.

                                          Fixed Valuehttp://terminology.hl7.org/CodeSystem/observation-category
                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          62. Observation.category:VSCat.coding.version
                                          Definition

                                          The version of the code system which was used when choosing this code. Note that a well-maintained code system does not need the version reported, because the meaning of codes is consistent across versions. However this cannot consistently be assured, and when the meaning is not guaranteed to be consistent, the version SHOULD be exchanged.

                                          ShortVersion of the system - if relevant
                                          Comments

                                          Where the terminology does not clearly define what string should be used to identify code system versions, the recommendation is to use the date (expressed in FHIR date format) on which that version was officially published as the version date.

                                          NoteThis is a business version Id, not a resource version Id (see discussion)
                                          Control0..1
                                          Typestring
                                          Is Modifierfalse
                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                          Summarytrue
                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          64. Observation.category:VSCat.coding.code
                                          Definition

                                          A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).

                                          ShortSymbol in syntax defined by the system
                                          Control1..1
                                          Typecode
                                          Is Modifierfalse
                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                          Must Supporttrue
                                          Summarytrue
                                          Requirements

                                          Need to refer to a particular code in the system.

                                          Fixed Valuevital-signs
                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          66. Observation.category:VSCat.coding.display
                                          Definition

                                          A representation of the meaning of the code in the system, following the rules of the system.

                                          ShortRepresentation defined by the system
                                          Control0..1
                                          Typestring
                                          Is Modifierfalse
                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                          Summarytrue
                                          Requirements

                                          Need to be able to carry a human-readable meaning of the code for readers that do not know the system.

                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          68. Observation.category:VSCat.coding.userSelected
                                          Definition

                                          Indicates that this coding was chosen by a user directly - e.g. off a pick list of available items (codes or displays).

                                          ShortIf this coding was chosen directly by the user
                                          Comments

                                          Amongst a set of alternatives, a directly chosen code is the most appropriate starting point for new translations. There is some ambiguity about what exactly 'directly chosen' implies, and trading partner agreement may be needed to clarify the use of this element and its consequences more completely.

                                          Control0..1
                                          Typeboolean
                                          Is Modifierfalse
                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                          Summarytrue
                                          Requirements

                                          This has been identified as a clinical safety criterium - that this exact system/code pair was chosen explicitly, rather than inferred by the system based on some rules or language processing.

                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          70. Observation.category:VSCat.text
                                          Definition

                                          A human language representation of the concept as seen/selected/uttered by the user who entered the data and/or which represents the intended meaning of the user.

                                          ShortPlain text representation of the concept
                                          Comments

                                          Very often the text is the same as a displayName of one of the codings.

                                          Control0..1
                                          Typestring
                                          Is Modifierfalse
                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                          Summarytrue
                                          Requirements

                                          The codes from the terminologies do not always capture the correct meaning with all the nuances of the human using them, or sometimes there is no appropriate code at all. In these cases, the text is used to capture the full meaning of the source.

                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          72. Observation.code
                                          Definition

                                          Blood Pressure.

                                          ShortBlood Pressure
                                          Comments

                                          additional codes that translate or map to this code are allowed. For example a more granular LOINC code or code that is used locally in a system.

                                          Control1..1
                                          BindingUnless not suitable, these codes SHALL be taken from VitalSigns
                                          (extensible to http://hl7.org/fhir/ValueSet/observation-vitalsignresult)

                                          This identifies the vital sign result type.

                                          TypeCodeableConcept
                                          Is Modifierfalse
                                          Must Supporttrue
                                          Summarytrue
                                          Requirements
                                          1. SHALL contain exactly one [1..1] code, where the @code SHOULD be selected from ValueSet HITSP Vital Sign Result Type 2.16.840.1.113883.3.88.12.80.62 DYNAMIC (CONF:7301).
                                          Alternate NamesName, Test
                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          74. Observation.code.id
                                          Definition

                                          Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                          ShortUnique id for inter-element referencing
                                          Control0..1
                                          Typestring
                                          Is Modifierfalse
                                          XML FormatIn the XML format, this property is represented as an attribute.
                                          Summaryfalse
                                          76. Observation.code.extension
                                          Definition

                                          May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                          ShortAdditional content defined by implementations
                                          Comments

                                          There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                          Control0..*
                                          TypeExtension
                                          Is Modifierfalse
                                          Summaryfalse
                                          Alternate Namesextensions, user content
                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                          SlicingThis element introduces a set of slices on Observation.code.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                          • value @ url
                                          • 78. Observation.code.coding
                                            Definition

                                            A reference to a code defined by a terminology system.

                                            ShortCode defined by a terminology system
                                            Comments

                                            Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                                            Control1..*
                                            TypeCoding
                                            Is Modifierfalse
                                            Summarytrue
                                            Requirements

                                            Allows for alternative encodings within a code system, and translations to other code systems.

                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                            SlicingThis element introduces a set of slices on Observation.code.coding. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                            • value @ code
                                            • value @ system
                                            • 80. Observation.code.coding:BPCode
                                              Slice NameBPCode
                                              Definition

                                              A reference to a code defined by a terminology system.

                                              ShortCode defined by a terminology system
                                              Comments

                                              Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                                              Control1..1
                                              TypeCoding
                                              Is Modifierfalse
                                              Summarytrue
                                              Requirements

                                              Allows for alternative encodings within a code system, and translations to other code systems.

                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              82. Observation.code.coding:BPCode.id
                                              Definition

                                              Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                              ShortUnique id for inter-element referencing
                                              Control0..1
                                              Typestring
                                              Is Modifierfalse
                                              XML FormatIn the XML format, this property is represented as an attribute.
                                              Summaryfalse
                                              84. Observation.code.coding:BPCode.extension
                                              Definition

                                              May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                              ShortAdditional content defined by implementations
                                              Comments

                                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                              Control0..*
                                              TypeExtension
                                              Is Modifierfalse
                                              Summaryfalse
                                              Alternate Namesextensions, user content
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                              SlicingThis element introduces a set of slices on Observation.code.coding.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                              • value @ url
                                              • 86. Observation.code.coding:BPCode.system
                                                Definition

                                                The identification of the code system that defines the meaning of the symbol in the code.

                                                ShortIdentity of the terminology system
                                                Comments

                                                The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.

                                                Control1..1
                                                Typeuri
                                                Is Modifierfalse
                                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                Summarytrue
                                                Requirements

                                                Need to be unambiguous about the source of the definition of the symbol.

                                                Fixed Valuehttp://loinc.org
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                88. Observation.code.coding:BPCode.version
                                                Definition

                                                The version of the code system which was used when choosing this code. Note that a well-maintained code system does not need the version reported, because the meaning of codes is consistent across versions. However this cannot consistently be assured, and when the meaning is not guaranteed to be consistent, the version SHOULD be exchanged.

                                                ShortVersion of the system - if relevant
                                                Comments

                                                Where the terminology does not clearly define what string should be used to identify code system versions, the recommendation is to use the date (expressed in FHIR date format) on which that version was officially published as the version date.

                                                NoteThis is a business version Id, not a resource version Id (see discussion)
                                                Control0..1
                                                Typestring
                                                Is Modifierfalse
                                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                Summarytrue
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                90. Observation.code.coding:BPCode.code
                                                Definition

                                                A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).

                                                ShortSymbol in syntax defined by the system
                                                Control1..1
                                                Typecode
                                                Is Modifierfalse
                                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                Summarytrue
                                                Requirements

                                                Need to refer to a particular code in the system.

                                                Fixed Value85354-9
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                92. Observation.code.coding:BPCode.display
                                                Definition

                                                A representation of the meaning of the code in the system, following the rules of the system.

                                                ShortRepresentation defined by the system
                                                Control0..1
                                                Typestring
                                                Is Modifierfalse
                                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                Summarytrue
                                                Requirements

                                                Need to be able to carry a human-readable meaning of the code for readers that do not know the system.

                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                94. Observation.code.coding:BPCode.userSelected
                                                Definition

                                                Indicates that this coding was chosen by a user directly - e.g. off a pick list of available items (codes or displays).

                                                ShortIf this coding was chosen directly by the user
                                                Comments

                                                Amongst a set of alternatives, a directly chosen code is the most appropriate starting point for new translations. There is some ambiguity about what exactly 'directly chosen' implies, and trading partner agreement may be needed to clarify the use of this element and its consequences more completely.

                                                Control0..1
                                                Typeboolean
                                                Is Modifierfalse
                                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                Summarytrue
                                                Requirements

                                                This has been identified as a clinical safety criterium - that this exact system/code pair was chosen explicitly, rather than inferred by the system based on some rules or language processing.

                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                96. Observation.code.text
                                                Definition

                                                A human language representation of the concept as seen/selected/uttered by the user who entered the data and/or which represents the intended meaning of the user.

                                                ShortPlain text representation of the concept
                                                Comments

                                                Very often the text is the same as a displayName of one of the codings.

                                                Control0..1
                                                Typestring
                                                Is Modifierfalse
                                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                Summarytrue
                                                Requirements

                                                The codes from the terminologies do not always capture the correct meaning with all the nuances of the human using them, or sometimes there is no appropriate code at all. In these cases, the text is used to capture the full meaning of the source.

                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                98. Observation.subject
                                                Definition

                                                The patient, or group of patients, location, or device this observation is about and into whose record the observation is placed. If the actual focus of the observation is different from the subject (or a sample of, part, or region of the subject), the focus element or the code itself specifies the actual focus of the observation.

                                                ShortWho and/or what the observation is about
                                                Comments

                                                One would expect this element to be a cardinality of 1..1. The only circumstance in which the subject can be missing is when the observation is made by a device that does not know the patient. In this case, the observation SHALL be matched to a patient through some context/channel matching technique, and at this point, the observation should be updated.

                                                Control1..1
                                                TypeReference(Patient)
                                                Is Modifierfalse
                                                Must Supporttrue
                                                Summarytrue
                                                Requirements

                                                Observations have no value if you don't know who or what they're about.

                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                100. Observation.focus
                                                Definition

                                                The actual focus of an observation when it is not the patient of record representing something or someone associated with the patient such as a spouse, parent, fetus, or donor. For example, fetus observations in a mother's record. The focus of an observation could also be an existing condition, an intervention, the subject's diet, another observation of the subject, or a body structure such as tumor or implanted device. An example use case would be using the Observation resource to capture whether the mother is trained to change her child's tracheostomy tube. In this example, the child is the patient of record and the mother is the focus.

                                                ShortWhat the observation is about, when it is not about the subject of record
                                                Comments

                                                Typically, an observation is made about the subject - a patient, or group of patients, location, or device - and the distinction between the subject and what is directly measured for an observation is specified in the observation code itself ( e.g., "Blood Glucose") and does not need to be represented separately using this element. Use specimen if a reference to a specimen is required. If a code is required instead of a resource use either bodysite for bodysites or the standard extension focusCode.

                                                Control0..*
                                                TypeReference(Resource)
                                                Is Modifierfalse
                                                Summarytrue
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                102. Observation.encounter
                                                Definition

                                                The healthcare event (e.g. a patient and healthcare provider interaction) during which this observation is made.

                                                ShortHealthcare event during which this observation is made
                                                Comments

                                                This will typically be the encounter the event occurred within, but some events may be initiated prior to or after the official completion of an encounter but still be tied to the context of the encounter (e.g. pre-admission laboratory tests).

                                                Control0..1
                                                TypeReference(FR Core Encounter Profile)
                                                Is Modifierfalse
                                                Summarytrue
                                                Requirements

                                                For some observations it may be important to know the link between an observation and a particular encounter.

                                                Alternate NamesContext
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                104. Observation.effective[x]
                                                Definition

                                                Often just a dateTime for Vital Signs

                                                ShortOften just a dateTime for Vital Signs
                                                Comments

                                                At least a date should be present unless this observation is a historical report. For recording imprecise or "fuzzy" times (For example, a blood glucose measurement taken "after breakfast") use the Timing datatype which allow the measurement to be tied to regular life events.

                                                Control1..1
                                                This element is affected by the following invariants: vs-1
                                                TypeChoice of: dateTime, Period
                                                [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                Is Modifierfalse
                                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                Must Supporttrue
                                                Must Support TypesNo must-support rules about the choice of types/profiles
                                                Summarytrue
                                                Requirements

                                                Knowing when an observation was deemed true is important to its relevance as well as determining trends.

                                                Alternate NamesOccurrence
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                vs-1: if Observation.effective[x] is dateTime and has a value then that value shall be precise to the day ($this is dateTime implies $this.toString().length() >= 10)
                                                106. Observation.issued
                                                Definition

                                                The date and time this version of the observation was made available to providers, typically after the results have been reviewed and verified.

                                                ShortDate/Time this version was made available
                                                Comments

                                                For Observations that don’t require review and verification, it may be the same as the lastUpdated time of the resource itself. For Observations that do require review and verification for certain updates, it might not be the same as the lastUpdated time of the resource itself due to a non-clinically significant update that doesn’t require the new version to be reviewed and verified again.

                                                Control0..1
                                                Typeinstant
                                                Is Modifierfalse
                                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                Summarytrue
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                108. Observation.performer
                                                Definition

                                                Who was responsible for asserting the observed value as "true".

                                                ShortWho is responsible for the observation
                                                Control0..*
                                                TypeReference(CareTeam, FR Core Patient Profile, FR Core Practitioner Profile, PractitionerRole, FR Core Organization Profile, FR Core Related Person Profile)
                                                Is Modifierfalse
                                                Summarytrue
                                                Requirements

                                                May give a degree of confidence in the observation and also indicates where follow-up questions should be directed.

                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                110. Observation.value[x]
                                                Definition

                                                Vital Signs value are recorded using the Quantity data type. For supporting observations such as Cuff size could use other datatypes such as CodeableConcept.

                                                ShortVital Signs value are recorded using the Quantity data type. For supporting observations such as Cuff size could use other datatypes such as CodeableConcept.
                                                Comments

                                                An observation may have; 1) a single value here, 2) both a value and a set of related or component values, or 3) only a set of related or component values. If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                                                Control0..0
                                                This element is affected by the following invariants: obs-7, vs-2
                                                TypeQuantity
                                                Is Modifierfalse
                                                Must Supporttrue
                                                Summarytrue
                                                Requirements
                                                1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                SlicingThis element introduces a set of slices on Observation.value[x]. The slices areUnordered and Closed, and can be differentiated using the following discriminators:
                                                • type @ $this
                                                • 112. Observation.value[x]:valueQuantity
                                                  Slice NamevalueQuantity
                                                  Definition

                                                  Vital Signs value are recorded using the Quantity data type. For supporting observations such as Cuff size could use other datatypes such as CodeableConcept.

                                                  ShortVital Signs value are recorded using the Quantity data type. For supporting observations such as Cuff size could use other datatypes such as CodeableConcept.
                                                  Comments

                                                  An observation may have; 1) a single value here, 2) both a value and a set of related or component values, or 3) only a set of related or component values. If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                                                  Control0..0
                                                  This element is affected by the following invariants: obs-7, vs-2
                                                  TypeQuantity
                                                  Is Modifierfalse
                                                  Must Supporttrue
                                                  Summarytrue
                                                  Requirements
                                                  1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  114. Observation.dataAbsentReason
                                                  Definition

                                                  Provides a reason why the expected value in the element Observation.value[x] is missing.

                                                  ShortWhy the result is missing
                                                  Comments

                                                  Null or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "specimen unsatisfactory".

                                                  The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Note that an observation may only be reported if there are values to report. For example differential cell counts values may be reported only when > 0. Because of these options, use-case agreements are required to interpret general observations for null or exceptional values.

                                                  Control0..1
                                                  This element is affected by the following invariants: obs-6, vs-2
                                                  BindingUnless not suitable, these codes SHALL be taken from DataAbsentReason
                                                  (extensible to http://hl7.org/fhir/ValueSet/data-absent-reason)

                                                  Codes specifying why the result (Observation.value[x]) is missing.

                                                  TypeCodeableConcept
                                                  Is Modifierfalse
                                                  Must Supporttrue
                                                  Summaryfalse
                                                  Requirements

                                                  For many results it is necessary to handle exceptional values in measurements.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  116. Observation.interpretation
                                                  Definition

                                                  A categorical assessment of an observation value. For example, high, low, normal.

                                                  ShortHigh, low, normal, etc.
                                                  Comments

                                                  Historically used for laboratory results (known as 'abnormal flag' ), its use extends to other use cases where coded interpretations are relevant. Often reported as one or more simple compact codes this element is often placed adjacent to the result value in reports and flow sheets to signal the meaning/normalcy status of the result.

                                                  Control0..*
                                                  BindingUnless not suitable, these codes SHALL be taken from ObservationInterpretationCodes
                                                  (extensible to http://hl7.org/fhir/ValueSet/observation-interpretation)

                                                  Codes identifying interpretations of observations.

                                                  TypeCodeableConcept
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Requirements

                                                  For some results, particularly numeric results, an interpretation is necessary to fully understand the significance of a result.

                                                  Alternate NamesAbnormal Flag
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  118. Observation.note
                                                  Definition

                                                  Comments about the observation or the results.

                                                  ShortComments about the observation
                                                  Comments

                                                  May include general statements about the observation, or statements about significant, unexpected or unreliable results values, or information about its source when relevant to its interpretation.

                                                  Control0..*
                                                  TypeAnnotation
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Requirements

                                                  Need to be able to provide free text additional information.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  120. Observation.bodySite
                                                  Definition

                                                  Indicates the site on the subject's body where the observation was made (i.e. the target site).

                                                  ShortObserved body part
                                                  Comments

                                                  Only used if not implicit in code found in Observation.code. In many systems, this may be represented as a related observation instead of an inline component.

                                                  If the use case requires BodySite to be handled as a separate resource (e.g. to identify and track separately) then use the standard extension bodySite.

                                                  Control0..1
                                                  BindingFor example codes, see http://hl7.org/fhir/hspc/ValueSet/bpMeasBodyLocationPrecoordVS
                                                  (example to http://hl7.org/fhir/hspc/ValueSet/bpMeasBodyLocationPrecoordVS)
                                                  TypeCodeableConcept
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  122. Observation.method
                                                  Definition

                                                  Indicates the mechanism used to perform the observation.

                                                  ShortHow it was done
                                                  Comments

                                                  Only used if not implicit in code for Observation.code.

                                                  Control0..1
                                                  BindingFor example codes, see https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-bp-measurement-method
                                                  (example to https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-bp-measurement-method)
                                                  TypeCodeableConcept
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Requirements

                                                  In some cases, method can impact results and is thus used for determining whether results can be compared or determining significance of results.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  124. Observation.specimen
                                                  Definition

                                                  The specimen that was used when this observation was made.

                                                  ShortSpecimen used for this observation
                                                  Comments

                                                  Should only be used if not implicit in code found in Observation.code. Observations are not made on specimens themselves; they are made on a subject, but in many cases by the means of a specimen. Note that although specimens are often involved, they are not always tracked and reported explicitly. Also note that observation resources may be used in contexts that track the specimen explicitly (e.g. Diagnostic Report).

                                                  Control0..1
                                                  TypeReference(Specimen)
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  126. Observation.device
                                                  Definition

                                                  The device used to generate the observation data.

                                                  Short(Measurement) Device
                                                  Comments

                                                  Note that this is not meant to represent a device involved in the transmission of the result, e.g., a gateway. Such devices may be documented using the Provenance resource where relevant.

                                                  Control0..1
                                                  TypeReference(Device, DeviceMetric)
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  128. Observation.referenceRange
                                                  Definition

                                                  Guidance on how to interpret the value by comparison to a normal or recommended range. Multiple reference ranges are interpreted as an "OR". In other words, to represent two distinct target populations, two referenceRange elements would be used.

                                                  ShortProvides guide for interpretation
                                                  Comments

                                                  Most observations only have one generic reference range. Systems MAY choose to restrict to only supplying the relevant reference range based on knowledge about the patient (e.g., specific to the patient's age, gender, weight and other factors), but this might not be possible or appropriate. Whenever more than one reference range is supplied, the differences between them SHOULD be provided in the reference range and/or age properties.

                                                  Control0..*
                                                  TypeBackboneElement
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Requirements

                                                  Knowing what values are considered "normal" can help evaluate the significance of a particular result. Need to be able to provide multiple reference ranges for different contexts.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  obs-3: Must have at least a low or a high or text (low.exists() or high.exists() or text.exists())
                                                  130. Observation.referenceRange.id
                                                  Definition

                                                  Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                  ShortUnique id for inter-element referencing
                                                  Control0..1
                                                  Typestring
                                                  Is Modifierfalse
                                                  XML FormatIn the XML format, this property is represented as an attribute.
                                                  Summaryfalse
                                                  132. Observation.referenceRange.extension
                                                  Definition

                                                  May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                  ShortAdditional content defined by implementations
                                                  Comments

                                                  There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                  Control0..*
                                                  TypeExtension
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Alternate Namesextensions, user content
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                  134. Observation.referenceRange.modifierExtension
                                                  Definition

                                                  May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                                  Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                                  ShortExtensions that cannot be ignored even if unrecognized
                                                  Comments

                                                  There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                  Control0..*
                                                  TypeExtension
                                                  Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                                  Summarytrue
                                                  Requirements

                                                  Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                                  Alternate Namesextensions, user content, modifiers
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                  136. Observation.referenceRange.low
                                                  Definition

                                                  The value of the low bound of the reference range. The low bound of the reference range endpoint is inclusive of the value (e.g. reference range is >=5 - <=9). If the low bound is omitted, it is assumed to be meaningless (e.g. reference range is <=2.3).

                                                  ShortLow Range, if relevant
                                                  Control0..1
                                                  This element is affected by the following invariants: obs-3
                                                  TypeQuantity(SimpleQuantity)
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  138. Observation.referenceRange.high
                                                  Definition

                                                  The value of the high bound of the reference range. The high bound of the reference range endpoint is inclusive of the value (e.g. reference range is >=5 - <=9). If the high bound is omitted, it is assumed to be meaningless (e.g. reference range is >= 2.3).

                                                  ShortHigh Range, if relevant
                                                  Control0..1
                                                  This element is affected by the following invariants: obs-3
                                                  TypeQuantity(SimpleQuantity)
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  140. Observation.referenceRange.type
                                                  Definition

                                                  Codes to indicate the what part of the targeted reference population it applies to. For example, the normal or therapeutic range.

                                                  ShortReference range qualifier
                                                  Comments

                                                  This SHOULD be populated if there is more than one range. If this element is not present then the normal range is assumed.

                                                  Control0..1
                                                  BindingThe codes SHOULD be taken from ObservationReferenceRangeMeaningCodes
                                                  (preferred to http://hl7.org/fhir/ValueSet/referencerange-meaning)

                                                  Code for the meaning of a reference range.

                                                  TypeCodeableConcept
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Requirements

                                                  Need to be able to say what kind of reference range this is - normal, recommended, therapeutic, etc., - for proper interpretation.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  142. Observation.referenceRange.appliesTo
                                                  Definition

                                                  Codes to indicate the target population this reference range applies to. For example, a reference range may be based on the normal population or a particular sex or race. Multiple appliesTo are interpreted as an "AND" of the target populations. For example, to represent a target population of African American females, both a code of female and a code for African American would be used.

                                                  ShortReference range population
                                                  Comments

                                                  This SHOULD be populated if there is more than one range. If this element is not present then the normal population is assumed.

                                                  Control0..*
                                                  BindingFor example codes, see ObservationReferenceRangeAppliesToCodes
                                                  (example to http://hl7.org/fhir/ValueSet/referencerange-appliesto)

                                                  Codes identifying the population the reference range applies to.

                                                  TypeCodeableConcept
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Requirements

                                                  Need to be able to identify the target population for proper interpretation.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  144. Observation.referenceRange.age
                                                  Definition

                                                  The age at which this reference range is applicable. This is a neonatal age (e.g. number of weeks at term) if the meaning says so.

                                                  ShortApplicable age range, if relevant
                                                  Control0..1
                                                  TypeRange
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Requirements

                                                  Some analytes vary greatly over age.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  146. Observation.referenceRange.text
                                                  Definition

                                                  Text based reference range in an observation which may be used when a quantitative range is not appropriate for an observation. An example would be a reference value of "Negative" or a list or table of "normals".

                                                  ShortText based reference range in an observation
                                                  Control0..1
                                                  Typestring
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  148. Observation.hasMember
                                                  Definition

                                                  Used when reporting vital signs panel components.

                                                  ShortUsed when reporting vital signs panel components
                                                  Comments

                                                  When using this element, an observation will typically have either a value or a set of related resources, although both may be present in some cases. For a discussion on the ways Observations can assembled in groups together, see Notes below. Note that a system may calculate results from QuestionnaireResponse into a final score and represent the score as an Observation.

                                                  Control0..*
                                                  TypeReference(QuestionnaireResponse, MolecularSequence, Vital Signs Profile)
                                                  Is Modifierfalse
                                                  Summarytrue
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  150. Observation.derivedFrom
                                                  Definition

                                                  The target resource that represents a measurement from which this observation value is derived. For example, a calculated anion gap or a fetal measurement based on an ultrasound image.

                                                  ShortRelated measurements the observation is made from
                                                  Comments

                                                  All the reference choices that are listed in this element can represent clinical observations and other measurements that may be the source for a derived value. The most common reference will be another Observation. For a discussion on the ways Observations can assembled in groups together, see Notes below.

                                                  Control0..*
                                                  TypeReference(DocumentReference, ImagingStudy, Media, QuestionnaireResponse, MolecularSequence, Vital Signs Profile)
                                                  Is Modifierfalse
                                                  Summarytrue
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  152. Observation.component
                                                  Definition

                                                  Used when reporting systolic and diastolic blood pressure.

                                                  ShortUsed when reporting systolic and diastolic blood pressure.
                                                  Comments

                                                  For a discussion on the ways Observations can be assembled in groups together see Notes below.

                                                  Control2..*
                                                  TypeBackboneElement
                                                  Is Modifierfalse
                                                  Must Supporttrue
                                                  Summarytrue
                                                  Requirements

                                                  Component observations share the same attributes in the Observation resource as the primary observation and are always treated a part of a single observation (they are not separable). However, the reference range for the primary observation value is not inherited by the component values and is required when appropriate for each component observation.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  vs-3: If there is no a value a data absent reason must be present (value.exists() or dataAbsentReason.exists())
                                                  SlicingThis element introduces a set of slices on Observation.component. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                  • value @ code.coding.code
                                                  • value @ code.coding.system
                                                  • 154. Observation.component.id
                                                    Definition

                                                    Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                    ShortUnique id for inter-element referencing
                                                    Control0..1
                                                    Typestring
                                                    Is Modifierfalse
                                                    XML FormatIn the XML format, this property is represented as an attribute.
                                                    Summaryfalse
                                                    156. Observation.component.extension
                                                    Definition

                                                    May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                    ShortAdditional content defined by implementations
                                                    Comments

                                                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                    Control0..*
                                                    TypeExtension
                                                    Is Modifierfalse
                                                    Summaryfalse
                                                    Alternate Namesextensions, user content
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    158. Observation.component.modifierExtension
                                                    Definition

                                                    May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                                    Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                                    ShortExtensions that cannot be ignored even if unrecognized
                                                    Comments

                                                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                    Control0..*
                                                    TypeExtension
                                                    Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                                    Summarytrue
                                                    Requirements

                                                    Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                                    Alternate Namesextensions, user content, modifiers
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    160. Observation.component.code
                                                    Definition

                                                    Describes what was observed. Sometimes this is called the observation "code".

                                                    ShortType of component observation (code / type)
                                                    Comments

                                                    All code-value and component.code-component.value pairs need to be taken into account to correctly understand the meaning of the observation.

                                                    Control1..1
                                                    BindingUnless not suitable, these codes SHALL be taken from VitalSigns
                                                    (extensible to http://hl7.org/fhir/ValueSet/observation-vitalsignresult)

                                                    This identifies the vital sign result type.

                                                    TypeCodeableConcept
                                                    Is Modifierfalse
                                                    Must Supporttrue
                                                    Summarytrue
                                                    Requirements

                                                    Knowing what kind of observation is being made is essential to understanding the observation.

                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    162. Observation.component.value[x]
                                                    Definition

                                                    Vital Sign Value recorded with UCUM.

                                                    ShortVital Sign Value recorded with UCUM
                                                    Comments

                                                    Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                                                    Control0..1
                                                    This element is affected by the following invariants: vs-3
                                                    BindingUnless not suitable, these codes SHALL be taken from VitalSignsUnits
                                                    (extensible to http://hl7.org/fhir/ValueSet/ucum-vitals-common|4.0.1)

                                                    Common UCUM units for recording Vital Signs.

                                                    TypeChoice of: Quantity, CodeableConcept, string, boolean, integer, Range, Ratio, SampledData, time, dateTime, Period
                                                    [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                    Is Modifierfalse
                                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                    Must Supporttrue
                                                    Must Support TypesNo must-support rules about the choice of types/profiles
                                                    Summarytrue
                                                    Requirements
                                                    1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    164. Observation.component.dataAbsentReason
                                                    Definition

                                                    Provides a reason why the expected value in the element Observation.component.value[x] is missing.

                                                    ShortWhy the component result is missing
                                                    Comments

                                                    "Null" or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "test not done".

                                                    The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Because of these options, use-case agreements are required to interpret general observations for exceptional values.

                                                    Control0..1
                                                    This element is affected by the following invariants: obs-6, vs-3
                                                    BindingUnless not suitable, these codes SHALL be taken from DataAbsentReason
                                                    (extensible to http://hl7.org/fhir/ValueSet/data-absent-reason)

                                                    Codes specifying why the result (Observation.value[x]) is missing.

                                                    TypeCodeableConcept
                                                    Is Modifierfalse
                                                    Must Supporttrue
                                                    Summaryfalse
                                                    Requirements

                                                    For many results it is necessary to handle exceptional values in measurements.

                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    166. Observation.component.interpretation
                                                    Definition

                                                    A categorical assessment of an observation value. For example, high, low, normal.

                                                    ShortHigh, low, normal, etc.
                                                    Comments

                                                    Historically used for laboratory results (known as 'abnormal flag' ), its use extends to other use cases where coded interpretations are relevant. Often reported as one or more simple compact codes this element is often placed adjacent to the result value in reports and flow sheets to signal the meaning/normalcy status of the result.

                                                    Control0..*
                                                    BindingUnless not suitable, these codes SHALL be taken from ObservationInterpretationCodes
                                                    (extensible to http://hl7.org/fhir/ValueSet/observation-interpretation)

                                                    Codes identifying interpretations of observations.

                                                    TypeCodeableConcept
                                                    Is Modifierfalse
                                                    Summaryfalse
                                                    Requirements

                                                    For some results, particularly numeric results, an interpretation is necessary to fully understand the significance of a result.

                                                    Alternate NamesAbnormal Flag
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    168. Observation.component.referenceRange
                                                    Definition

                                                    Guidance on how to interpret the value by comparison to a normal or recommended range.

                                                    ShortProvides guide for interpretation of component result
                                                    Comments

                                                    Most observations only have one generic reference range. Systems MAY choose to restrict to only supplying the relevant reference range based on knowledge about the patient (e.g., specific to the patient's age, gender, weight and other factors), but this might not be possible or appropriate. Whenever more than one reference range is supplied, the differences between them SHOULD be provided in the reference range and/or age properties.

                                                    Control0..*
                                                    TypeSeettp://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange
                                                    Is Modifierfalse
                                                    Summaryfalse
                                                    Requirements

                                                    Knowing what values are considered "normal" can help evaluate the significance of a particular result. Need to be able to provide multiple reference ranges for different contexts.

                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    170. Observation.component:SystolicBP
                                                    Slice NameSystolicBP
                                                    Definition

                                                    Used when reporting systolic and diastolic blood pressure.

                                                    ShortUsed when reporting systolic and diastolic blood pressure.
                                                    Comments

                                                    For a discussion on the ways Observations can be assembled in groups together see Notes below.

                                                    Control1..1
                                                    TypeBackboneElement
                                                    Is Modifierfalse
                                                    Must Supporttrue
                                                    Summarytrue
                                                    Requirements

                                                    Component observations share the same attributes in the Observation resource as the primary observation and are always treated a part of a single observation (they are not separable). However, the reference range for the primary observation value is not inherited by the component values and is required when appropriate for each component observation.

                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    vs-3: If there is no a value a data absent reason must be present (value.exists() or dataAbsentReason.exists())
                                                    172. Observation.component:SystolicBP.id
                                                    Definition

                                                    Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                    ShortUnique id for inter-element referencing
                                                    Control0..1
                                                    Typestring
                                                    Is Modifierfalse
                                                    XML FormatIn the XML format, this property is represented as an attribute.
                                                    Summaryfalse
                                                    174. Observation.component:SystolicBP.extension
                                                    Definition

                                                    May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                    ShortAdditional content defined by implementations
                                                    Comments

                                                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                    Control0..*
                                                    TypeExtension
                                                    Is Modifierfalse
                                                    Summaryfalse
                                                    Alternate Namesextensions, user content
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    176. Observation.component:SystolicBP.modifierExtension
                                                    Definition

                                                    May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                                    Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                                    ShortExtensions that cannot be ignored even if unrecognized
                                                    Comments

                                                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                    Control0..*
                                                    TypeExtension
                                                    Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                                    Summarytrue
                                                    Requirements

                                                    Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                                    Alternate Namesextensions, user content, modifiers
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    178. Observation.component:SystolicBP.code
                                                    Definition

                                                    Describes what was observed. Sometimes this is called the observation "code".

                                                    ShortType of component observation (code / type)
                                                    Comments

                                                    additional codes that translate or map to this code are allowed. For example a more granular LOINC code or code that is used locally in a system.

                                                    Control1..1
                                                    BindingUnless not suitable, these codes SHALL be taken from VitalSigns
                                                    (extensible to http://hl7.org/fhir/ValueSet/observation-vitalsignresult)

                                                    This identifies the vital sign result type.

                                                    TypeCodeableConcept
                                                    Is Modifierfalse
                                                    Must Supporttrue
                                                    Summarytrue
                                                    Requirements

                                                    Knowing what kind of observation is being made is essential to understanding the observation.

                                                    Alternate NamesComponent Test, Component Name
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    180. Observation.component:SystolicBP.code.id
                                                    Definition

                                                    Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                    ShortUnique id for inter-element referencing
                                                    Control0..1
                                                    Typestring
                                                    Is Modifierfalse
                                                    XML FormatIn the XML format, this property is represented as an attribute.
                                                    Summaryfalse
                                                    182. Observation.component:SystolicBP.code.extension
                                                    Definition

                                                    May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                    ShortAdditional content defined by implementations
                                                    Comments

                                                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                    Control0..*
                                                    TypeExtension
                                                    Is Modifierfalse
                                                    Summaryfalse
                                                    Alternate Namesextensions, user content
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    SlicingThis element introduces a set of slices on Observation.component.code.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                    • value @ url
                                                    • 184. Observation.component:SystolicBP.code.coding
                                                      Definition

                                                      Systolic Blood Pressure.

                                                      ShortSystolic Blood Pressure
                                                      Comments

                                                      Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                                                      Control1..*
                                                      TypeCoding
                                                      Is Modifierfalse
                                                      Summarytrue
                                                      Requirements

                                                      Allows for alternative encodings within a code system, and translations to other code systems.

                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                      SlicingThis element introduces a set of slices on Observation.component.code.coding. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                      • value @ code
                                                      • value @ system
                                                      • 186. Observation.component:SystolicBP.code.coding:SBPCode
                                                        Slice NameSBPCode
                                                        Definition

                                                        Systolic Blood Pressure.

                                                        ShortSystolic Blood Pressure
                                                        Comments

                                                        Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                                                        Control1..1
                                                        TypeCoding
                                                        Is Modifierfalse
                                                        Summarytrue
                                                        Requirements

                                                        Allows for alternative encodings within a code system, and translations to other code systems.

                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                        188. Observation.component:SystolicBP.code.coding:SBPCode.id
                                                        Definition

                                                        Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                        ShortUnique id for inter-element referencing
                                                        Control0..1
                                                        Typestring
                                                        Is Modifierfalse
                                                        XML FormatIn the XML format, this property is represented as an attribute.
                                                        Summaryfalse
                                                        190. Observation.component:SystolicBP.code.coding:SBPCode.extension
                                                        Definition

                                                        May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                        ShortAdditional content defined by implementations
                                                        Comments

                                                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                        Control0..*
                                                        TypeExtension
                                                        Is Modifierfalse
                                                        Summaryfalse
                                                        Alternate Namesextensions, user content
                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                        SlicingThis element introduces a set of slices on Observation.component.code.coding.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                        • value @ url
                                                        • 192. Observation.component:SystolicBP.code.coding:SBPCode.system
                                                          Definition

                                                          The identification of the code system that defines the meaning of the symbol in the code.

                                                          ShortIdentity of the terminology system
                                                          Comments

                                                          The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.

                                                          Control1..1
                                                          Typeuri
                                                          Is Modifierfalse
                                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                          Summarytrue
                                                          Requirements

                                                          Need to be unambiguous about the source of the definition of the symbol.

                                                          Fixed Valuehttp://loinc.org
                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                          194. Observation.component:SystolicBP.code.coding:SBPCode.version
                                                          Definition

                                                          The version of the code system which was used when choosing this code. Note that a well-maintained code system does not need the version reported, because the meaning of codes is consistent across versions. However this cannot consistently be assured, and when the meaning is not guaranteed to be consistent, the version SHOULD be exchanged.

                                                          ShortVersion of the system - if relevant
                                                          Comments

                                                          Where the terminology does not clearly define what string should be used to identify code system versions, the recommendation is to use the date (expressed in FHIR date format) on which that version was officially published as the version date.

                                                          NoteThis is a business version Id, not a resource version Id (see discussion)
                                                          Control0..1
                                                          Typestring
                                                          Is Modifierfalse
                                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                          Summarytrue
                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                          196. Observation.component:SystolicBP.code.coding:SBPCode.code
                                                          Definition

                                                          A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).

                                                          ShortSymbol in syntax defined by the system
                                                          Control1..1
                                                          Typecode
                                                          Is Modifierfalse
                                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                          Summarytrue
                                                          Requirements

                                                          Need to refer to a particular code in the system.

                                                          Fixed Value8480-6
                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                          198. Observation.component:SystolicBP.code.coding:SBPCode.display
                                                          Definition

                                                          A representation of the meaning of the code in the system, following the rules of the system.

                                                          ShortRepresentation defined by the system
                                                          Control0..1
                                                          Typestring
                                                          Is Modifierfalse
                                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                          Summarytrue
                                                          Requirements

                                                          Need to be able to carry a human-readable meaning of the code for readers that do not know the system.

                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                          200. Observation.component:SystolicBP.code.coding:SBPCode.userSelected
                                                          Definition

                                                          Indicates that this coding was chosen by a user directly - e.g. off a pick list of available items (codes or displays).

                                                          ShortIf this coding was chosen directly by the user
                                                          Comments

                                                          Amongst a set of alternatives, a directly chosen code is the most appropriate starting point for new translations. There is some ambiguity about what exactly 'directly chosen' implies, and trading partner agreement may be needed to clarify the use of this element and its consequences more completely.

                                                          Control0..1
                                                          Typeboolean
                                                          Is Modifierfalse
                                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                          Summarytrue
                                                          Requirements

                                                          This has been identified as a clinical safety criterium - that this exact system/code pair was chosen explicitly, rather than inferred by the system based on some rules or language processing.

                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                          202. Observation.component:SystolicBP.code.text
                                                          Definition

                                                          A human language representation of the concept as seen/selected/uttered by the user who entered the data and/or which represents the intended meaning of the user.

                                                          ShortPlain text representation of the concept
                                                          Comments

                                                          Very often the text is the same as a displayName of one of the codings.

                                                          Control0..1
                                                          Typestring
                                                          Is Modifierfalse
                                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                          Summarytrue
                                                          Requirements

                                                          The codes from the terminologies do not always capture the correct meaning with all the nuances of the human using them, or sometimes there is no appropriate code at all. In these cases, the text is used to capture the full meaning of the source.

                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                          204. Observation.component:SystolicBP.value[x]
                                                          Definition

                                                          Vital Sign Value recorded with UCUM.

                                                          ShortVital Sign Value recorded with UCUM
                                                          Comments

                                                          Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                                                          Control0..1
                                                          This element is affected by the following invariants: vs-3
                                                          BindingUnless not suitable, these codes SHALL be taken from VitalSignsUnits
                                                          (extensible to http://hl7.org/fhir/ValueSet/ucum-vitals-common|4.0.1)

                                                          Common UCUM units for recording Vital Signs.

                                                          TypeQuantity
                                                          [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                          Is Modifierfalse
                                                          Must Supporttrue
                                                          Summarytrue
                                                          Requirements
                                                          1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).
                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                          SlicingThis element introduces a set of slices on Observation.component.value[x]. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                          • type @ $this
                                                          • 206. Observation.component:SystolicBP.value[x].id
                                                            Definition

                                                            Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                            ShortUnique id for inter-element referencing
                                                            Control0..1
                                                            Typestring
                                                            Is Modifierfalse
                                                            XML FormatIn the XML format, this property is represented as an attribute.
                                                            Summaryfalse
                                                            208. Observation.component:SystolicBP.value[x].extension
                                                            Definition

                                                            May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                            ShortAdditional content defined by implementations
                                                            Comments

                                                            There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                            Control0..*
                                                            TypeExtension
                                                            Is Modifierfalse
                                                            Summaryfalse
                                                            Alternate Namesextensions, user content
                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                            SlicingThis element introduces a set of slices on Observation.component.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                            • value @ url
                                                            • 210. Observation.component:SystolicBP.value[x].value
                                                              Definition

                                                              The value of the measured amount. The value includes an implicit precision in the presentation of the value.

                                                              ShortNumerical value (with implicit precision)
                                                              Comments

                                                              The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).

                                                              Control1..1
                                                              Typedecimal
                                                              Is Modifierfalse
                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                              Must Supporttrue
                                                              Summarytrue
                                                              Requirements

                                                              Precision is handled implicitly in almost all cases of measurement.

                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              212. Observation.component:SystolicBP.value[x].comparator
                                                              Definition

                                                              How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.

                                                              Short< | <= | >= | > - how to understand the value
                                                              Control0..1
                                                              BindingThe codes SHALL be taken from QuantityComparator
                                                              (required to http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1)

                                                              How the Quantity should be understood and represented.

                                                              Typecode
                                                              Is Modifiertrue because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                              Summarytrue
                                                              Requirements

                                                              Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

                                                              Meaning if MissingIf there is no comparator, then there is no modification of the value
                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              214. Observation.component:SystolicBP.value[x].unit
                                                              Definition

                                                              A human-readable form of the unit.

                                                              ShortUnit representation
                                                              Control1..1
                                                              Typestring
                                                              Is Modifierfalse
                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                              Must Supporttrue
                                                              Summarytrue
                                                              Requirements

                                                              There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.

                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              216. Observation.component:SystolicBP.value[x].system
                                                              Definition

                                                              The identification of the system that provides the coded form of the unit.

                                                              ShortSystem that defines coded unit form
                                                              Control1..1
                                                              This element is affected by the following invariants: qty-3
                                                              Typeuri
                                                              Is Modifierfalse
                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                              Must Supporttrue
                                                              Summarytrue
                                                              Requirements

                                                              Need to know the system that defines the coded form of the unit.

                                                              Fixed Valuehttp://unitsofmeasure.org
                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              218. Observation.component:SystolicBP.value[x].code
                                                              Definition

                                                              Coded responses from the common UCUM units for vital signs value set.

                                                              ShortCoded responses from the common UCUM units for vital signs value set.
                                                              Comments

                                                              The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.

                                                              Control1..1
                                                              Typecode
                                                              Is Modifierfalse
                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                              Must Supporttrue
                                                              Summarytrue
                                                              Requirements

                                                              Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.

                                                              Fixed Valuemm[Hg]
                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              220. Observation.component:SystolicBP.dataAbsentReason
                                                              Definition

                                                              Provides a reason why the expected value in the element Observation.component.value[x] is missing.

                                                              ShortWhy the component result is missing
                                                              Comments

                                                              "Null" or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "test not done".

                                                              The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Because of these options, use-case agreements are required to interpret general observations for exceptional values.

                                                              Control0..1
                                                              This element is affected by the following invariants: obs-6, vs-3
                                                              BindingUnless not suitable, these codes SHALL be taken from DataAbsentReason
                                                              (extensible to http://hl7.org/fhir/ValueSet/data-absent-reason)

                                                              Codes specifying why the result (Observation.value[x]) is missing.

                                                              TypeCodeableConcept
                                                              Is Modifierfalse
                                                              Must Supporttrue
                                                              Summaryfalse
                                                              Requirements

                                                              For many results it is necessary to handle exceptional values in measurements.

                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              222. Observation.component:SystolicBP.interpretation
                                                              Definition

                                                              A categorical assessment of an observation value. For example, high, low, normal.

                                                              ShortHigh, low, normal, etc.
                                                              Comments

                                                              Historically used for laboratory results (known as 'abnormal flag' ), its use extends to other use cases where coded interpretations are relevant. Often reported as one or more simple compact codes this element is often placed adjacent to the result value in reports and flow sheets to signal the meaning/normalcy status of the result.

                                                              Control0..*
                                                              BindingUnless not suitable, these codes SHALL be taken from ObservationInterpretationCodes
                                                              (extensible to http://hl7.org/fhir/ValueSet/observation-interpretation)

                                                              Codes identifying interpretations of observations.

                                                              TypeCodeableConcept
                                                              Is Modifierfalse
                                                              Summaryfalse
                                                              Requirements

                                                              For some results, particularly numeric results, an interpretation is necessary to fully understand the significance of a result.

                                                              Alternate NamesAbnormal Flag
                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              224. Observation.component:SystolicBP.referenceRange
                                                              Definition

                                                              Guidance on how to interpret the value by comparison to a normal or recommended range.

                                                              ShortProvides guide for interpretation of component result
                                                              Comments

                                                              Most observations only have one generic reference range. Systems MAY choose to restrict to only supplying the relevant reference range based on knowledge about the patient (e.g., specific to the patient's age, gender, weight and other factors), but this might not be possible or appropriate. Whenever more than one reference range is supplied, the differences between them SHOULD be provided in the reference range and/or age properties.

                                                              Control0..*
                                                              TypeSeettp://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange
                                                              Is Modifierfalse
                                                              Summaryfalse
                                                              Requirements

                                                              Knowing what values are considered "normal" can help evaluate the significance of a particular result. Need to be able to provide multiple reference ranges for different contexts.

                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              226. Observation.component:DiastolicBP
                                                              Slice NameDiastolicBP
                                                              Definition

                                                              Used when reporting diastolic blood pressure.

                                                              ShortUsed when reporting diastolic blood pressure.
                                                              Comments

                                                              For a discussion on the ways Observations can be assembled in groups together see Notes below.

                                                              Control1..1
                                                              TypeBackboneElement
                                                              Is Modifierfalse
                                                              Must Supporttrue
                                                              Summarytrue
                                                              Requirements

                                                              Component observations share the same attributes in the Observation resource as the primary observation and are always treated a part of a single observation (they are not separable). However, the reference range for the primary observation value is not inherited by the component values and is required when appropriate for each component observation.

                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              vs-3: If there is no a value a data absent reason must be present (value.exists() or dataAbsentReason.exists())
                                                              228. Observation.component:DiastolicBP.id
                                                              Definition

                                                              Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                              ShortUnique id for inter-element referencing
                                                              Control0..1
                                                              Typestring
                                                              Is Modifierfalse
                                                              XML FormatIn the XML format, this property is represented as an attribute.
                                                              Summaryfalse
                                                              230. Observation.component:DiastolicBP.extension
                                                              Definition

                                                              May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                              ShortAdditional content defined by implementations
                                                              Comments

                                                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                              Control0..*
                                                              TypeExtension
                                                              Is Modifierfalse
                                                              Summaryfalse
                                                              Alternate Namesextensions, user content
                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                              232. Observation.component:DiastolicBP.modifierExtension
                                                              Definition

                                                              May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                                              Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                                              ShortExtensions that cannot be ignored even if unrecognized
                                                              Comments

                                                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                              Control0..*
                                                              TypeExtension
                                                              Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                                              Summarytrue
                                                              Requirements

                                                              Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                                              Alternate Namesextensions, user content, modifiers
                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                              234. Observation.component:DiastolicBP.code
                                                              Definition

                                                              Describes what was observed. Sometimes this is called the observation "code".

                                                              ShortType of component observation (code / type)
                                                              Comments

                                                              additional codes that translate or map to this code are allowed. For example a more granular LOINC code or code that is used locally in a system.

                                                              Control1..1
                                                              BindingUnless not suitable, these codes SHALL be taken from VitalSigns
                                                              (extensible to http://hl7.org/fhir/ValueSet/observation-vitalsignresult)

                                                              This identifies the vital sign result type.

                                                              TypeCodeableConcept
                                                              Is Modifierfalse
                                                              Must Supporttrue
                                                              Summarytrue
                                                              Requirements

                                                              Knowing what kind of observation is being made is essential to understanding the observation.

                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              236. Observation.component:DiastolicBP.code.id
                                                              Definition

                                                              Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                              ShortUnique id for inter-element referencing
                                                              Control0..1
                                                              Typestring
                                                              Is Modifierfalse
                                                              XML FormatIn the XML format, this property is represented as an attribute.
                                                              Summaryfalse
                                                              238. Observation.component:DiastolicBP.code.extension
                                                              Definition

                                                              May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                              ShortAdditional content defined by implementations
                                                              Comments

                                                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                              Control0..*
                                                              TypeExtension
                                                              Is Modifierfalse
                                                              Summaryfalse
                                                              Alternate Namesextensions, user content
                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                              SlicingThis element introduces a set of slices on Observation.component.code.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                              • value @ url
                                                              • 240. Observation.component:DiastolicBP.code.coding
                                                                Definition

                                                                Diastolic Blood Pressure.

                                                                ShortDiastolic Blood Pressure
                                                                Comments

                                                                Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                                                                Control1..*
                                                                TypeCoding
                                                                Is Modifierfalse
                                                                Summarytrue
                                                                Requirements

                                                                Allows for alternative encodings within a code system, and translations to other code systems.

                                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                SlicingThis element introduces a set of slices on Observation.component.code.coding. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                • value @ code
                                                                • value @ system
                                                                • 242. Observation.component:DiastolicBP.code.coding:DBPCode
                                                                  Slice NameDBPCode
                                                                  Definition

                                                                  Diastolic Blood Pressure.

                                                                  ShortDiastolic Blood Pressure
                                                                  Comments

                                                                  Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                                                                  Control1..1
                                                                  TypeCoding
                                                                  Is Modifierfalse
                                                                  Summarytrue
                                                                  Requirements

                                                                  Allows for alternative encodings within a code system, and translations to other code systems.

                                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                  244. Observation.component:DiastolicBP.code.coding:DBPCode.id
                                                                  Definition

                                                                  Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                  ShortUnique id for inter-element referencing
                                                                  Control0..1
                                                                  Typestring
                                                                  Is Modifierfalse
                                                                  XML FormatIn the XML format, this property is represented as an attribute.
                                                                  Summaryfalse
                                                                  246. Observation.component:DiastolicBP.code.coding:DBPCode.extension
                                                                  Definition

                                                                  May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                  ShortAdditional content defined by implementations
                                                                  Comments

                                                                  There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                  Control0..*
                                                                  TypeExtension
                                                                  Is Modifierfalse
                                                                  Summaryfalse
                                                                  Alternate Namesextensions, user content
                                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                  SlicingThis element introduces a set of slices on Observation.component.code.coding.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                  • value @ url
                                                                  • 248. Observation.component:DiastolicBP.code.coding:DBPCode.system
                                                                    Definition

                                                                    The identification of the code system that defines the meaning of the symbol in the code.

                                                                    ShortIdentity of the terminology system
                                                                    Comments

                                                                    The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.

                                                                    Control1..1
                                                                    Typeuri
                                                                    Is Modifierfalse
                                                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                    Summarytrue
                                                                    Requirements

                                                                    Need to be unambiguous about the source of the definition of the symbol.

                                                                    Fixed Valuehttp://loinc.org
                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                    250. Observation.component:DiastolicBP.code.coding:DBPCode.version
                                                                    Definition

                                                                    The version of the code system which was used when choosing this code. Note that a well-maintained code system does not need the version reported, because the meaning of codes is consistent across versions. However this cannot consistently be assured, and when the meaning is not guaranteed to be consistent, the version SHOULD be exchanged.

                                                                    ShortVersion of the system - if relevant
                                                                    Comments

                                                                    Where the terminology does not clearly define what string should be used to identify code system versions, the recommendation is to use the date (expressed in FHIR date format) on which that version was officially published as the version date.

                                                                    NoteThis is a business version Id, not a resource version Id (see discussion)
                                                                    Control0..1
                                                                    Typestring
                                                                    Is Modifierfalse
                                                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                    Summarytrue
                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                    252. Observation.component:DiastolicBP.code.coding:DBPCode.code
                                                                    Definition

                                                                    A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination).

                                                                    ShortSymbol in syntax defined by the system
                                                                    Control1..1
                                                                    Typecode
                                                                    Is Modifierfalse
                                                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                    Summarytrue
                                                                    Requirements

                                                                    Need to refer to a particular code in the system.

                                                                    Fixed Value8462-4
                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                    254. Observation.component:DiastolicBP.code.coding:DBPCode.display
                                                                    Definition

                                                                    A representation of the meaning of the code in the system, following the rules of the system.

                                                                    ShortRepresentation defined by the system
                                                                    Control0..1
                                                                    Typestring
                                                                    Is Modifierfalse
                                                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                    Summarytrue
                                                                    Requirements

                                                                    Need to be able to carry a human-readable meaning of the code for readers that do not know the system.

                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                    256. Observation.component:DiastolicBP.code.coding:DBPCode.userSelected
                                                                    Definition

                                                                    Indicates that this coding was chosen by a user directly - e.g. off a pick list of available items (codes or displays).

                                                                    ShortIf this coding was chosen directly by the user
                                                                    Comments

                                                                    Amongst a set of alternatives, a directly chosen code is the most appropriate starting point for new translations. There is some ambiguity about what exactly 'directly chosen' implies, and trading partner agreement may be needed to clarify the use of this element and its consequences more completely.

                                                                    Control0..1
                                                                    Typeboolean
                                                                    Is Modifierfalse
                                                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                    Summarytrue
                                                                    Requirements

                                                                    This has been identified as a clinical safety criterium - that this exact system/code pair was chosen explicitly, rather than inferred by the system based on some rules or language processing.

                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                    258. Observation.component:DiastolicBP.code.text
                                                                    Definition

                                                                    A human language representation of the concept as seen/selected/uttered by the user who entered the data and/or which represents the intended meaning of the user.

                                                                    ShortPlain text representation of the concept
                                                                    Comments

                                                                    Very often the text is the same as a displayName of one of the codings.

                                                                    Control0..1
                                                                    Typestring
                                                                    Is Modifierfalse
                                                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                    Summarytrue
                                                                    Requirements

                                                                    The codes from the terminologies do not always capture the correct meaning with all the nuances of the human using them, or sometimes there is no appropriate code at all. In these cases, the text is used to capture the full meaning of the source.

                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                    260. Observation.component:DiastolicBP.value[x]
                                                                    Definition

                                                                    Vital Sign Value recorded with UCUM.

                                                                    ShortVital Sign Value recorded with UCUM
                                                                    Comments

                                                                    Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                                                                    Control0..1
                                                                    This element is affected by the following invariants: vs-3
                                                                    BindingUnless not suitable, these codes SHALL be taken from VitalSignsUnits
                                                                    (extensible to http://hl7.org/fhir/ValueSet/ucum-vitals-common|4.0.1)

                                                                    Common UCUM units for recording Vital Signs.

                                                                    TypeQuantity
                                                                    [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                                    Is Modifierfalse
                                                                    Must Supporttrue
                                                                    Summarytrue
                                                                    Requirements
                                                                    1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).
                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                    SlicingThis element introduces a set of slices on Observation.component.value[x]. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                    • type @ $this
                                                                    • 262. Observation.component:DiastolicBP.value[x].id
                                                                      Definition

                                                                      Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                      ShortUnique id for inter-element referencing
                                                                      Control0..1
                                                                      Typestring
                                                                      Is Modifierfalse
                                                                      XML FormatIn the XML format, this property is represented as an attribute.
                                                                      Summaryfalse
                                                                      264. Observation.component:DiastolicBP.value[x].extension
                                                                      Definition

                                                                      May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                      ShortAdditional content defined by implementations
                                                                      Comments

                                                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                      Control0..*
                                                                      TypeExtension
                                                                      Is Modifierfalse
                                                                      Summaryfalse
                                                                      Alternate Namesextensions, user content
                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                      SlicingThis element introduces a set of slices on Observation.component.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                      • value @ url
                                                                      • 266. Observation.component:DiastolicBP.value[x].value
                                                                        Definition

                                                                        The value of the measured amount. The value includes an implicit precision in the presentation of the value.

                                                                        ShortNumerical value (with implicit precision)
                                                                        Comments

                                                                        The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).

                                                                        Control1..1
                                                                        Typedecimal
                                                                        Is Modifierfalse
                                                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                        Must Supporttrue
                                                                        Summarytrue
                                                                        Requirements

                                                                        Precision is handled implicitly in almost all cases of measurement.

                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        268. Observation.component:DiastolicBP.value[x].comparator
                                                                        Definition

                                                                        How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.

                                                                        Short< | <= | >= | > - how to understand the value
                                                                        Control0..1
                                                                        BindingThe codes SHALL be taken from QuantityComparator
                                                                        (required to http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1)

                                                                        How the Quantity should be understood and represented.

                                                                        Typecode
                                                                        Is Modifiertrue because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
                                                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                        Summarytrue
                                                                        Requirements

                                                                        Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

                                                                        Meaning if MissingIf there is no comparator, then there is no modification of the value
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        270. Observation.component:DiastolicBP.value[x].unit
                                                                        Definition

                                                                        A human-readable form of the unit.

                                                                        ShortUnit representation
                                                                        Control1..1
                                                                        Typestring
                                                                        Is Modifierfalse
                                                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                        Must Supporttrue
                                                                        Summarytrue
                                                                        Requirements

                                                                        There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.

                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        272. Observation.component:DiastolicBP.value[x].system
                                                                        Definition

                                                                        The identification of the system that provides the coded form of the unit.

                                                                        ShortSystem that defines coded unit form
                                                                        Control1..1
                                                                        This element is affected by the following invariants: qty-3
                                                                        Typeuri
                                                                        Is Modifierfalse
                                                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                        Must Supporttrue
                                                                        Summarytrue
                                                                        Requirements

                                                                        Need to know the system that defines the coded form of the unit.

                                                                        Fixed Valuehttp://unitsofmeasure.org
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        274. Observation.component:DiastolicBP.value[x].code
                                                                        Definition

                                                                        Coded responses from the common UCUM units for vital signs value set.

                                                                        ShortCoded responses from the common UCUM units for vital signs value set.
                                                                        Comments

                                                                        The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.

                                                                        Control1..1
                                                                        Typecode
                                                                        Is Modifierfalse
                                                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                        Must Supporttrue
                                                                        Summarytrue
                                                                        Requirements

                                                                        Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.

                                                                        Fixed Valuemm[Hg]
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        276. Observation.component:DiastolicBP.dataAbsentReason
                                                                        Definition

                                                                        Provides a reason why the expected value in the element Observation.component.value[x] is missing.

                                                                        ShortWhy the component result is missing
                                                                        Comments

                                                                        "Null" or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "test not done".

                                                                        The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Because of these options, use-case agreements are required to interpret general observations for exceptional values.

                                                                        Control0..1
                                                                        This element is affected by the following invariants: obs-6, vs-3
                                                                        BindingUnless not suitable, these codes SHALL be taken from DataAbsentReason
                                                                        (extensible to http://hl7.org/fhir/ValueSet/data-absent-reason)

                                                                        Codes specifying why the result (Observation.value[x]) is missing.

                                                                        TypeCodeableConcept
                                                                        Is Modifierfalse
                                                                        Must Supporttrue
                                                                        Summaryfalse
                                                                        Requirements

                                                                        For many results it is necessary to handle exceptional values in measurements.

                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        278. Observation.component:DiastolicBP.interpretation
                                                                        Definition

                                                                        A categorical assessment of an observation value. For example, high, low, normal.

                                                                        ShortHigh, low, normal, etc.
                                                                        Comments

                                                                        Historically used for laboratory results (known as 'abnormal flag' ), its use extends to other use cases where coded interpretations are relevant. Often reported as one or more simple compact codes this element is often placed adjacent to the result value in reports and flow sheets to signal the meaning/normalcy status of the result.

                                                                        Control0..*
                                                                        BindingUnless not suitable, these codes SHALL be taken from ObservationInterpretationCodes
                                                                        (extensible to http://hl7.org/fhir/ValueSet/observation-interpretation)

                                                                        Codes identifying interpretations of observations.

                                                                        TypeCodeableConcept
                                                                        Is Modifierfalse
                                                                        Summaryfalse
                                                                        Requirements

                                                                        For some results, particularly numeric results, an interpretation is necessary to fully understand the significance of a result.

                                                                        Alternate NamesAbnormal Flag
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        280. Observation.component:DiastolicBP.referenceRange
                                                                        Definition

                                                                        Guidance on how to interpret the value by comparison to a normal or recommended range.

                                                                        ShortProvides guide for interpretation of component result
                                                                        Comments

                                                                        Most observations only have one generic reference range. Systems MAY choose to restrict to only supplying the relevant reference range based on knowledge about the patient (e.g., specific to the patient's age, gender, weight and other factors), but this might not be possible or appropriate. Whenever more than one reference range is supplied, the differences between them SHOULD be provided in the reference range and/or age properties.

                                                                        Control0..*
                                                                        TypeSeettp://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange
                                                                        Is Modifierfalse
                                                                        Summaryfalse
                                                                        Requirements

                                                                        Knowing what values are considered "normal" can help evaluate the significance of a particular result. Need to be able to provide multiple reference ranges for different contexts.

                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        282. Observation.component:MeanBP
                                                                        Slice NameMeanBP
                                                                        Definition

                                                                        Mean blood pressure

                                                                        ShortMean blood pressure
                                                                        Comments

                                                                        For a discussion on the ways Observations can be assembled in groups together see Notes below.

                                                                        Control0..1
                                                                        TypeBackboneElement
                                                                        Is Modifierfalse
                                                                        Must Supporttrue
                                                                        Summarytrue
                                                                        Requirements

                                                                        Component observations share the same attributes in the Observation resource as the primary observation and are always treated a part of a single observation (they are not separable). However, the reference range for the primary observation value is not inherited by the component values and is required when appropriate for each component observation.

                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        vs-3: If there is no a value a data absent reason must be present (value.exists() or dataAbsentReason.exists())
                                                                        284. Observation.component:MeanBP.id
                                                                        Definition

                                                                        Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                        ShortUnique id for inter-element referencing
                                                                        Control0..1
                                                                        Typestring
                                                                        Is Modifierfalse
                                                                        XML FormatIn the XML format, this property is represented as an attribute.
                                                                        Summaryfalse
                                                                        286. Observation.component:MeanBP.extension
                                                                        Definition

                                                                        May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                        ShortAdditional content defined by implementations
                                                                        Comments

                                                                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                        Control0..*
                                                                        TypeExtension
                                                                        Is Modifierfalse
                                                                        Summaryfalse
                                                                        Alternate Namesextensions, user content
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                        288. Observation.component:MeanBP.modifierExtension
                                                                        Definition

                                                                        May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                                                        Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                                                        ShortExtensions that cannot be ignored even if unrecognized
                                                                        Comments

                                                                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                        Control0..*
                                                                        TypeExtension
                                                                        Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                                                        Summarytrue
                                                                        Requirements

                                                                        Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                                                        Alternate Namesextensions, user content, modifiers
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                        290. Observation.component:MeanBP.code
                                                                        Definition

                                                                        Describes what was observed. Sometimes this is called the observation "code".

                                                                        ShortType of component observation (code / type)
                                                                        Comments

                                                                        All code-value and component.code-component.value pairs need to be taken into account to correctly understand the meaning of the observation.

                                                                        Control1..1
                                                                        BindingUnless not suitable, these codes SHALL be taken from VitalSigns
                                                                        (extensible to http://hl7.org/fhir/ValueSet/observation-vitalsignresult)

                                                                        This identifies the vital sign result type.

                                                                        TypeCodeableConcept
                                                                        Is Modifierfalse
                                                                        Must Supporttrue
                                                                        Summarytrue
                                                                        Requirements

                                                                        Knowing what kind of observation is being made is essential to understanding the observation.

                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        292. Observation.component:MeanBP.code.id
                                                                        Definition

                                                                        Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                        ShortUnique id for inter-element referencing
                                                                        Control0..1
                                                                        Typestring
                                                                        Is Modifierfalse
                                                                        XML FormatIn the XML format, this property is represented as an attribute.
                                                                        Summaryfalse
                                                                        294. Observation.component:MeanBP.code.extension
                                                                        Definition

                                                                        May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                        ShortAdditional content defined by implementations
                                                                        Comments

                                                                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                        Control0..*
                                                                        TypeExtension
                                                                        Is Modifierfalse
                                                                        Summaryfalse
                                                                        Alternate Namesextensions, user content
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                        SlicingThis element introduces a set of slices on Observation.component.code.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                        • value @ url
                                                                        • 296. Observation.component:MeanBP.code.coding
                                                                          Definition

                                                                          A reference to a code defined by a terminology system.

                                                                          ShortCode defined by a terminology system
                                                                          Comments

                                                                          Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                                                                          Control1..*
                                                                          TypeCoding
                                                                          Is Modifierfalse
                                                                          Summarytrue
                                                                          Requirements

                                                                          Allows for alternative encodings within a code system, and translations to other code systems.

                                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                          SlicingThis element introduces a set of slices on Observation.component.code.coding. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                          • value @ code
                                                                          • value @ system
                                                                          • 298. Observation.component:MeanBP.code.coding:MBPCode
                                                                            Slice NameMBPCode
                                                                            Definition

                                                                            A reference to a code defined by a terminology system.

                                                                            ShortCode defined by a terminology system
                                                                            Comments

                                                                            Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information. Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true.

                                                                            Control1..1
                                                                            TypeCoding
                                                                            Is Modifierfalse
                                                                            Summarytrue
                                                                            Requirements

                                                                            Allows for alternative encodings within a code system, and translations to other code systems.

                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            300. Observation.component:MeanBP.code.coding:MBPCode.id
                                                                            Definition

                                                                            Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                            ShortUnique id for inter-element referencing
                                                                            Control0..1
                                                                            Typestring
                                                                            Is Modifierfalse
                                                                            XML FormatIn the XML format, this property is represented as an attribute.
                                                                            Summaryfalse
                                                                            302. Observation.component:MeanBP.code.coding:MBPCode.extension
                                                                            Definition

                                                                            May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                            ShortAdditional content defined by implementations
                                                                            Comments

                                                                            There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                            Control0..*
                                                                            TypeExtension
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Alternate Namesextensions, user content
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            SlicingThis element introduces a set of slices on Observation.component.code.coding.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                            • value @ url
                                                                            • 304. Observation.component:MeanBP.code.coding:MBPCode.system
                                                                              Definition

                                                                              The identification of the code system that defines the meaning of the symbol in the code.

                                                                              ShortIdentity of the terminology system
                                                                              Comments

                                                                              The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.

                                                                              Control1..1
                                                                              Typeuri
                                                                              Is Modifierfalse
                                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                              Summarytrue
                                                                              Requirements

                                                                              Need to be unambiguous about the source of the definition of the symbol.

                                                                              Fixed Valuehttp://loinc.org
                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              306. Observation.component:MeanBP.code.coding:MBPCode.version
                                                                              Definition

                                                                              The version of the code system which was used when choosing this code. Note that a well-maintained code system does not need the version reported, because the meaning of codes is consistent across versions. However this cannot consistently be assured, and when the meaning is not guaranteed to be consistent, the version SHOULD be exchanged.

                                                                              ShortVersion of the system - if relevant
                                                                              Comments

                                                                              Where the terminology does not clearly define what string should be used to identify code system versions, the recommendation is to use the date (expressed in FHIR date format) on which that version was officially published as the version date.

                                                                              NoteThis is a business version Id, not a resource version Id (see discussion)
                                                                              Control0..1
                                                                              Typestring
                                                                              Is Modifierfalse
                                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                              Summarytrue
                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              308. Observation.component:MeanBP.code.coding:MBPCode.code
                                                                              Definition

                                                                              Mean blood pressure

                                                                              ShortMean blood pressure
                                                                              Control1..1
                                                                              Typecode
                                                                              Is Modifierfalse
                                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                              Summarytrue
                                                                              Requirements

                                                                              Need to refer to a particular code in the system.

                                                                              Fixed Value8478-0
                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              310. Observation.component:MeanBP.code.coding:MBPCode.display
                                                                              Definition

                                                                              A representation of the meaning of the code in the system, following the rules of the system.

                                                                              ShortRepresentation defined by the system
                                                                              Control0..1
                                                                              Typestring
                                                                              Is Modifierfalse
                                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                              Summarytrue
                                                                              Requirements

                                                                              Need to be able to carry a human-readable meaning of the code for readers that do not know the system.

                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              312. Observation.component:MeanBP.code.coding:MBPCode.userSelected
                                                                              Definition

                                                                              Indicates that this coding was chosen by a user directly - e.g. off a pick list of available items (codes or displays).

                                                                              ShortIf this coding was chosen directly by the user
                                                                              Comments

                                                                              Amongst a set of alternatives, a directly chosen code is the most appropriate starting point for new translations. There is some ambiguity about what exactly 'directly chosen' implies, and trading partner agreement may be needed to clarify the use of this element and its consequences more completely.

                                                                              Control0..1
                                                                              Typeboolean
                                                                              Is Modifierfalse
                                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                              Summarytrue
                                                                              Requirements

                                                                              This has been identified as a clinical safety criterium - that this exact system/code pair was chosen explicitly, rather than inferred by the system based on some rules or language processing.

                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              314. Observation.component:MeanBP.code.text
                                                                              Definition

                                                                              A human language representation of the concept as seen/selected/uttered by the user who entered the data and/or which represents the intended meaning of the user.

                                                                              ShortPlain text representation of the concept
                                                                              Comments

                                                                              Very often the text is the same as a displayName of one of the codings.

                                                                              Control0..1
                                                                              Typestring
                                                                              Is Modifierfalse
                                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                              Summarytrue
                                                                              Requirements

                                                                              The codes from the terminologies do not always capture the correct meaning with all the nuances of the human using them, or sometimes there is no appropriate code at all. In these cases, the text is used to capture the full meaning of the source.

                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              316. Observation.component:MeanBP.value[x]
                                                                              Definition

                                                                              Vital Sign Value recorded with UCUM.

                                                                              ShortVital Sign Value recorded with UCUM
                                                                              Comments

                                                                              Used when observation has a set of component observations. An observation may have both a value (e.g. an Apgar score) and component observations (the observations from which the Apgar score was derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For additional guidance, see the Notes section below.

                                                                              Control0..1
                                                                              This element is affected by the following invariants: vs-3
                                                                              BindingUnless not suitable, these codes SHALL be taken from VitalSignsUnits
                                                                              (extensible to http://hl7.org/fhir/ValueSet/ucum-vitals-common|4.0.1)

                                                                              Common UCUM units for recording Vital Signs.

                                                                              TypeChoice of: Quantity, CodeableConcept, string, boolean, integer, Range, Ratio, SampledData, time, dateTime, Period
                                                                              [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                                              Is Modifierfalse
                                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                              Must Supporttrue
                                                                              Must Support TypesNo must-support rules about the choice of types/profiles
                                                                              Summarytrue
                                                                              Requirements
                                                                              1. SHALL contain exactly one [1..1] value with @xsi:type="PQ" (CONF:7305).
                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              318. Observation.component:MeanBP.dataAbsentReason
                                                                              Definition

                                                                              Provides a reason why the expected value in the element Observation.component.value[x] is missing.

                                                                              ShortWhy the component result is missing
                                                                              Comments

                                                                              "Null" or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "test not done".

                                                                              The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Because of these options, use-case agreements are required to interpret general observations for exceptional values.

                                                                              Control0..1
                                                                              This element is affected by the following invariants: obs-6, vs-3
                                                                              BindingUnless not suitable, these codes SHALL be taken from DataAbsentReason
                                                                              (extensible to http://hl7.org/fhir/ValueSet/data-absent-reason)

                                                                              Codes specifying why the result (Observation.value[x]) is missing.

                                                                              TypeCodeableConcept
                                                                              Is Modifierfalse
                                                                              Must Supporttrue
                                                                              Summaryfalse
                                                                              Requirements

                                                                              For many results it is necessary to handle exceptional values in measurements.

                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              320. Observation.component:MeanBP.interpretation
                                                                              Definition

                                                                              A categorical assessment of an observation value. For example, high, low, normal.

                                                                              ShortHigh, low, normal, etc.
                                                                              Comments

                                                                              Historically used for laboratory results (known as 'abnormal flag' ), its use extends to other use cases where coded interpretations are relevant. Often reported as one or more simple compact codes this element is often placed adjacent to the result value in reports and flow sheets to signal the meaning/normalcy status of the result.

                                                                              Control0..*
                                                                              BindingUnless not suitable, these codes SHALL be taken from ObservationInterpretationCodes
                                                                              (extensible to http://hl7.org/fhir/ValueSet/observation-interpretation)

                                                                              Codes identifying interpretations of observations.

                                                                              TypeCodeableConcept
                                                                              Is Modifierfalse
                                                                              Summaryfalse
                                                                              Requirements

                                                                              For some results, particularly numeric results, an interpretation is necessary to fully understand the significance of a result.

                                                                              Alternate NamesAbnormal Flag
                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              322. Observation.component:MeanBP.referenceRange
                                                                              Definition

                                                                              Guidance on how to interpret the value by comparison to a normal or recommended range.

                                                                              ShortProvides guide for interpretation of component result
                                                                              Comments

                                                                              Most observations only have one generic reference range. Systems MAY choose to restrict to only supplying the relevant reference range based on knowledge about the patient (e.g., specific to the patient's age, gender, weight and other factors), but this might not be possible or appropriate. Whenever more than one reference range is supplied, the differences between them SHOULD be provided in the reference range and/or age properties.

                                                                              Control0..*
                                                                              TypeSeettp://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange
                                                                              Is Modifierfalse
                                                                              Summaryfalse
                                                                              Requirements

                                                                              Knowing what values are considered "normal" can help evaluate the significance of a particular result. Need to be able to provide multiple reference ranges for different contexts.

                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))