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:
  encounter:
    type: Reference
    mustSupport: true
    refers: ['http://hl7.org.au/fhir/core/StructureDefinition/au-core-encounter']
    index: 6
  component:
    short: Systolic Blood Pressure
    index: 13
    slicing:
      slices:
        SystolicBP:
          match: {}
          schema:
            short: Systolic Blood Pressure
            index: 13
            elements:
              code:
                elements:
                  coding:
                    short: SNOMED CT Systolic Blood Pressure
                    index: 14
                    slicing:
                      slices:
                        snomedSBP:
                          match: {}
                          schema:
                            short: SNOMED CT Systolic Blood Pressure
                            _required: true
                            index: 14
                            elements:
                              system:
                                pattern: {type: Uri, value: 'http://snomed.info/sct'}
                                index: 15
                              code:
                                pattern: {type: Code, value: '271649006'}
                                index: 16
                            required: [system, code]
                required: [coding]
              dataAbsentReason: {mustSupport: true, index: 17}
        DiastolicBP:
          match: {}
          schema:
            short: Diastolic Blood Pressure
            index: 18
            elements:
              code:
                elements:
                  coding:
                    short: SNOMED CT Diastolic Blood Pressure
                    index: 19
                    slicing:
                      slices:
                        snomedDBP:
                          match: {}
                          schema:
                            short: SNOMED CT Diastolic Blood Pressure
                            _required: true
                            index: 19
                            elements:
                              system:
                                pattern: {type: Uri, value: 'http://snomed.info/sct'}
                                index: 20
                              code:
                                pattern: {type: Code, value: '271650006'}
                                index: 21
                            required: [system, code]
                required: [coding]
              dataAbsentReason: {mustSupport: true, index: 22}
  effectiveDateTime:
    type: dateTime
    short: Date, and optionally time, the observation was performed
    constraint:
      au-core-obs-01: {human: Date shall be at least to day, source: 'http://hl7.org.au/fhir/core/StructureDefinition/au-core-bloodpressure', severity: error, expression: $this is DateTime implies $this.toString().length() >= 10}
    choiceOf: effective
    index: 9
  status:
    pattern: {type: Code, value: final}
    index: 0
  effective:
    short: Date, and optionally time, the observation was performed
    constraint:
      au-core-obs-01: {human: Date shall be at least to day, source: 'http://hl7.org.au/fhir/core/StructureDefinition/au-core-bloodpressure', severity: error, expression: $this is DateTime implies $this.toString().length() >= 10}
    choices: [effectiveDateTime]
    index: 8
  code:
    elements:
      coding:
        array: true
        min: 2
        index: 1
        slicing:
          slices:
            snomedBPCode:
              match: {}
              schema:
                short: SNOMED CT Blood Pressure
                _required: true
                index: 2
                elements:
                  system:
                    pattern: {type: Uri, value: 'http://snomed.info/sct'}
                    index: 3
                  code:
                    pattern: {type: Code, value: '75367002'}
                    index: 4
                required: [system, code]
  bodySite:
    binding: {strength: extensible, valueSet: 'https://healthterminologies.gov.au/fhir/ValueSet/body-site-1'}
    constraint:
      au-core-obs-04: {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: 12
  subject:
    type: Reference
    refers: ['http://hl7.org.au/fhir/core/StructureDefinition/au-core-patient']
    index: 5
  performer:
    type: Reference
    mustSupport: true
    refers: ['http://hl7.org.au/fhir/core/StructureDefinition/au-core-organization', 'http://hl7.org.au/fhir/core/StructureDefinition/au-core-patient', 'http://hl7.org.au/fhir/core/StructureDefinition/au-core-practitioner', 'http://hl7.org.au/fhir/core/StructureDefinition/au-core-practitionerrole', 'http://hl7.org.au/fhir/core/StructureDefinition/au-core-relatedperson']
    index: 10
  dataAbsentReason: {mustSupport: true, index: 11}
package_version: 0.1.0-draft
class: profile
kind: resource
url: http://hl7.org.au/fhir/core/StructureDefinition/au-core-bloodpressure
base: http://hl7.org/fhir/StructureDefinition/bp
version: 0.1.0-draft