description: '**CHR:** Drug use observations can be entered through the **Social History** section of the patient chart (`Patients → select patient → chart → Social History → Add → Substance Use → Recreational Drugs`). Drug use is not visible in the Patient Data panel summary. Parent observation with hasMember sub-observations for Frequency and Type.'
package_name: telus.dw.emr.extract-1-1-21
derivation: constraint
name: DwObservationDrugUse
type: Observation
elements:
  category:
    mustSupport: true
    index: 6
    elements:
      coding:
        binding: {strength: preferred, valueSet: 'http://hl7.org/fhir/ValueSet/observation-category'}
        index: 7
        elements:
          system:
            pattern: {type: Uri, value: 'http://terminology.hl7.org/CodeSystem/observation-category'}
            index: 8
          code:
            pattern: {type: Code, value: social-history}
            index: 9
  referenceRange: {index: 30}
  hasMember:
    type: Reference
    mustSupport: true
    refers: ['https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwObservationSocialHistory']
    index: 31
  meta:
    elements:
      lastUpdated: {mustSupport: true, index: 1}
      source: {mustSupport: true, index: 2}
      security: {mustSupport: true, index: 3}
    required: [lastUpdated]
  derivedFrom: {index: 32}
  interpretation: {index: 24}
  encounter:
    type: Reference
    refers: ['https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwEncounter']
    index: 17
  method: {index: 27}
  specimen: {index: 28}
  value:
    choices: []
    index: 23
  note: {index: 25}
  status: {mustSupport: true, index: 5}
  effective:
    mustSupport: true
    choices: []
    index: 19
  id: {mustSupport: true, index: 0}
  code:
    mustSupport: true
    index: 10
    elements:
      coding:
        binding: {strength: example, valueSet: 'http://hl7.org/fhir/ValueSet/observation-codes'}
        mustSupport: true
        index: 11
        elements:
          system:
            pattern: {type: Uri, value: 'http://loinc.org'}
            mustSupport: true
            index: 12
          code:
            pattern: {type: Code, value: 74204-9}
            mustSupport: true
            index: 13
          display:
            pattern: {type: String, value: Drug Use}
            mustSupport: true
            index: 14
      text: {index: 15}
  identifier: {mustSupport: true, index: 4}
  bodySite: {index: 26}
  issued: {index: 20}
  device: {index: 29}
  subject:
    type: Reference
    mustSupport: true
    refers: ['https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwPatient']
    index: 16
  performer:
    type: Reference
    refers: ['https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwCareTeam', 'https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwOrganization', 'https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwPatient', 'https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwPractitioner', 'https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwPractitionerRole']
    index: 21
package_version: 1.1.21
class: profile
kind: resource
url: https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwObservationDrugUse
base: http://hl7.org/fhir/StructureDefinition/Observation
version: 2.0.0
required: [id, subject, effective]