description: This profile sets minimum expectations for an Observation resource to record, search, and fetch blood pressure observations with standard coding and units of measure. It is based on the [FHIR Blood Pressure Profile](http://hl7.org/fhir/R4/bp.html) and identifies the *additional* mandatory core elements, extensions, vocabularies and value sets that **SHALL** be present in the Observation resource when conforming to this profile. It provides the floor for standards development for specific uses cases in an Australian context.
package_name: hl7.fhir.au.core
derivation: constraint
name: AUCoreBloodPressure
type: Observation
elements:
  category:
    index: 1
    slicing:
      slices:
        VSCat:
          match: {}
          schema:
            index: 2
            elements:
              coding:
                index: 3
                elements:
                  system: {index: 4}
                  code: {index: 5}
  component:
    index: 17
    elements:
      code: {index: 18}
      value:
        choices: []
        index: 20
      dataAbsentReason: {index: 21}
    slicing:
      slices:
        SystolicBP:
          match: {}
          schema:
            short: Systolic Blood Pressure
            index: 22
            elements:
              code:
                index: 23
                elements:
                  coding:
                    short: SNOMED CT Systolic Blood Pressure
                    index: 24
                    slicing:
                      slices:
                        snomedSBP:
                          match: {}
                          schema:
                            short: SNOMED CT Systolic Blood Pressure
                            _required: true
                            index: 24
                            elements:
                              system:
                                pattern: {type: Uri, value: 'http://snomed.info/sct'}
                                index: 25
                              code:
                                pattern: {type: Code, value: '271649006'}
                                index: 26
                            required: [system, code]
                required: [coding]
              valueQuantity:
                index: 27
                elements:
                  value: {index: 28}
                  unit: {index: 29}
                  system: {index: 30}
                  code: {index: 31}
              dataAbsentReason: {mustSupport: true, index: 32}
        DiastolicBP:
          match: {}
          schema:
            short: Diastolic Blood Pressure
            index: 33
            elements:
              code:
                index: 34
                elements:
                  coding:
                    short: SNOMED CT Diastolic Blood Pressure
                    index: 35
                    slicing:
                      slices:
                        snomedDBP:
                          match: {}
                          schema:
                            short: SNOMED CT Diastolic Blood Pressure
                            _required: true
                            index: 35
                            elements:
                              system:
                                pattern: {type: Uri, value: 'http://snomed.info/sct'}
                                index: 36
                              code:
                                pattern: {type: Code, value: '271650006'}
                                index: 37
                            required: [system, code]
                required: [coding]
              valueQuantity:
                index: 38
                elements:
                  value: {index: 39}
                  unit: {index: 40}
                  system: {index: 41}
                  code: {index: 42}
              dataAbsentReason: {mustSupport: true, index: 43}
  effectiveDateTime: {type: dateTime, short: 'Date, and optionally time, the observation was performed', choiceOf: effective, index: 14}
  status: {index: 0}
  effective:
    short: Date, and optionally time, the observation was performed
    choices: [effectiveDateTime]
    index: 13
  code:
    index: 6
    elements:
      coding:
        array: true
        min: 2
        index: 7
        slicing:
          slices:
            snomedBPCode:
              match: {}
              schema:
                short: SNOMED CT Blood Pressure
                _required: true
                index: 8
                elements:
                  system:
                    pattern: {type: Uri, value: 'http://snomed.info/sct'}
                    index: 9
                  code:
                    pattern: {type: Code, value: '75367002'}
                    index: 10
                required: [system, code]
  bodySite:
    binding: {strength: extensible, valueSet: 'https://healthterminologies.gov.au/fhir/ValueSet/body-site-1'}
    constraint:
      au-core-obs-01: {human: 'If a coded body site is provided, at least one code shall be from SNOMED CT', source: 'http://hl7.org.au/fhir/core/StructureDefinition/au-core-bloodpressure', severity: error, expression: 'coding.exists() implies coding.where(system=''http://snomed.info/sct'').exists()'}
    index: 16
  subject:
    type: Reference
    refers: ['http://hl7.org.au/fhir/core/StructureDefinition/au-core-patient']
    index: 11
  dataAbsentReason: {index: 15}
package_version: 1.0.0-preview
class: profile
kind: resource
url: http://hl7.org.au/fhir/core/StructureDefinition/au-core-bloodpressure
base: http://hl7.org/fhir/StructureDefinition/bp
version: 1.0.0-preview