description: This profile sets minimum expectations for an Observation resource to record, search, and fetch waist circumference observations with standard coding and units of measure. It is based on the [FHIR Vital Signs Profile](http://hl7.org/fhir/R4/vitalsigns.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: AUCoreWaistCircumference
type: Observation
elements:
  category:
    index: 1
    slicing:
      slices:
        VSCat:
          match: {}
          schema:
            index: 2
            elements:
              coding:
                index: 3
                elements:
                  system: {index: 4}
                  code: {index: 5}
  valueQuantity:
    short: Waist circumference
    index: 18
    elements:
      value: {type: decimal, index: 19}
      unit: {type: string, index: 20}
      system:
        type: uri
        pattern: {type: Uri, value: 'http://unitsofmeasure.org'}
        index: 21
      code:
        type: code
        short: Coded responses from the common UCUM units for vital signs value set.
        binding: {strength: required, valueSet: 'http://hl7.org/fhir/ValueSet/ucum-bodylength'}
        index: 22
    required: [value, unit, system, code]
  component:
    index: 25
    elements:
      code: {index: 26}
      value:
        choices: []
        index: 28
      dataAbsentReason: {index: 29}
  effectiveDateTime: {type: dateTime, short: 'Date, and optionally time, the observation was performed', choiceOf: effective, index: 17}
  status: {index: 0}
  effective:
    short: Date, and optionally time, the observation was performed
    choices: [effectiveDateTime]
    index: 16
  code:
    index: 6
    elements:
      coding:
        array: true
        min: 2
        index: 7
        slicing:
          rules: open
          ordered: false
          discriminator:
          - {path: code, type: value}
          - {path: system, type: value}
          min: 2
          slices:
            loincWaistCircumCode:
              match: {code: 8280-0, system: 'http://loinc.org'}
              schema:
                short: LOINC Waist Circumference
                _required: true
                index: 8
                elements:
                  system:
                    pattern: {type: Uri, value: 'http://loinc.org'}
                    index: 9
                  code:
                    pattern: {type: Code, value: 8280-0}
                    index: 10
                required: [system, code]
            snomedWaistCircumCode:
              match: {code: '276361009', system: 'http://snomed.info/sct'}
              schema:
                short: SNOMED CT Waist Circumference
                _required: true
                index: 11
                elements:
                  system:
                    pattern: {type: Uri, value: 'http://snomed.info/sct'}
                    index: 12
                  code:
                    pattern: {type: Code, value: '276361009'}
                    index: 13
                required: [system, code]
  bodySite:
    binding: {strength: preferred, 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-waistcircum', severity: error, expression: 'coding.exists() implies coding.where(system=''http://snomed.info/sct'').exists()'}
    index: 24
  subject:
    type: Reference
    refers: ['http://hl7.org.au/fhir/core/StructureDefinition/au-core-patient']
    index: 14
  dataAbsentReason: {index: 23}
package_version: 1.0.0-ballot
class: profile
kind: resource
url: http://hl7.org.au/fhir/core/StructureDefinition/au-core-waistcircum
base: http://hl7.org/fhir/StructureDefinition/vitalsigns
version: 1.0.0-ballot