description: This profile defines an observation structure that represents the gestational age related to pregnancy, for use in an Australian context.
package_name: hl7.fhir.au.base
derivation: constraint
name: AUGestationalAge
type: Observation
elements:
  value[x]:
    elements:
      value: {index: 20}
      unit: {index: 21}
      system:
        pattern: {type: Uri, value: 'http://unitsofmeasure.org'}
        index: 22
      code:
        pattern: {type: Code, value: d}
        index: 23
    required: [value, unit]
  valueQuantity: {type: Quantity, choiceOf: value, index: 19}
  value:
    choices: [valueQuantity]
    index: 18
  effectiveDateTime: {type: dateTime, short: 'Date, and optionally time, the observation was performed', choiceOf: effective, index: 16}
  status:
    pattern: {type: Code, value: final}
    index: 0
  effective:
    short: Date, and optionally time, the observation was performed
    choices: [effectiveDateTime]
    index: 15
  code:
    pattern:
      type: CodeableConcept
      value:
        coding:
        - {code: '57036006', system: 'http://snomed.info/sct'}
    index: 1
    elements:
      coding:
        index: 2
        slicing:
          rules: open
          discriminator:
          - {path: code, type: value}
          - {path: system, type: value}
          min: null
          slices:
            loincGestationalAge:
              match: {code: 18185-9, system: 'http://loinc.org'}
              schema:
                short: LOINC Gestational Age
                index: 3
                elements:
                  system:
                    pattern: {type: Uri, value: 'http://loinc.org'}
                    index: 4
                  code:
                    pattern: {type: Code, value: 18185-9}
                    index: 5
                required: [system, code]
            loincGestationalAgeByLMP:
              match: {code: 11885-1, system: 'http://loinc.org'}
              schema:
                short: LOINC Gestational Age by Last Menstrual Period (LMP)
                index: 6
                elements:
                  system:
                    pattern: {type: Uri, value: 'http://loinc.org'}
                    index: 7
                  code:
                    pattern: {type: Code, value: 11885-1}
                    index: 8
                required: [system, code]
            loincGestationalAgeByScan:
              match: {code: 11888-5, system: 'http://loinc.org'}
              schema:
                short: LOINC Gestational Age By Scan
                index: 9
                elements:
                  system:
                    pattern: {type: Uri, value: 'http://loinc.org'}
                    index: 10
                  code:
                    pattern: {type: Code, value: 11888-5}
                    index: 11
                required: [system, code]
  focus: {short: The fetus, index: 13}
  subject:
    type: Reference
    short: The pregnant individual
    refers: ['http://hl7.org/fhir/StructureDefinition/Patient']
    index: 12
package_version: 4.0.0
class: profile
kind: resource
url: http://hl7.org.au/fhir/StructureDefinition/au-gestationalage
base: http://hl7.org/fhir/StructureDefinition/Observation
version: 4.0.0
required: [effectiveDateTime, subject, effective]