description: This profile sets minimum expectations for an Observation resource to record, search, and fetch observations that represent a patient’s tobacco smoking start date with standard coding. It is based on the core FHIR [Observation](http://hl7.org/fhir/R4/observation.html) resource 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. \n\n Smoking start date is the date at which a person first started smoking. This date is typically recorded once for a person and is not subsequently updated if a person has quit and then restarted.
package_name: hl7.fhir.au.core
derivation: constraint
name: AUCoreSmokingStartDate
type: Observation
elements:
  category:
    mustSupport: true
    index: 1
    slicing:
      rules: open
      discriminator:
      - {path: $this, type: pattern}
      min: 1
      slices:
        socialHistory:
          match:
            coding:
            - {code: social-history, system: 'http://terminology.hl7.org/CodeSystem/observation-category'}
          schema:
            pattern:
              type: CodeableConcept
              value:
                coding:
                - {code: social-history, system: 'http://terminology.hl7.org/CodeSystem/observation-category'}
            _required: true
            index: 2
          min: 1
          max: 1
  encounter:
    type: Reference
    mustSupport: true
    refers: ['http://hl7.org.au/fhir/core/StructureDefinition/au-core-encounter']
    index: 5
  value:
    mustSupport: true
    choices: [valueDateTime]
    index: 11
  valueDateTime: {type: dateTime, mustSupport: true, choiceOf: value, index: 12}
  effectiveDateTime:
    constraint:
      au-core-obs-01: {human: Date shall be at least to day, source: 'http://hl7.org.au/fhir/core/StructureDefinition/au-core-smokingstartdate', severity: error, expression: $this is DateTime implies $this.toString().length() >= 10}
    short: Date, and optionally time, the observation was performed
    type: dateTime
    mustSupport: true
    choiceOf: effective
    index: 8
  status:
    pattern: {type: Code, value: final}
    mustSupport: true
    index: 0
  effective:
    constraint:
      au-core-obs-01: {human: Date shall be at least to day, source: 'http://hl7.org.au/fhir/core/StructureDefinition/au-core-smokingstartdate', severity: error, expression: $this is DateTime implies $this.toString().length() >= 10}
    short: Date, and optionally time, the observation was performed
    mustSupport: true
    choices: [effectiveDateTime]
    index: 7
  code:
    mustSupport: true
    pattern:
      type: CodeableConcept
      value:
        coding:
        - {code: '1507541000168104', system: 'http://snomed.info/sct'}
    index: 3
  subject:
    type: Reference
    mustSupport: true
    refers: ['http://hl7.org/fhir/StructureDefinition/Patient']
    index: 4
  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: 9
  dataAbsentReason: {mustSupport: true, index: 13}
package_version: 0.2.2-preview
class: profile
kind: resource
url: http://hl7.org.au/fhir/core/StructureDefinition/au-core-smokingstartdate
base: http://hl7.org/fhir/StructureDefinition/Observation
version: 0.2.2-preview
required: [effectiveDateTime, subject, category, effective]