description: '**CHR:** Drug use frequency is recorded through the **Social History** section of the patient chart (`Patients → select patient → chart → Social History → Substance Use → Recreational Drugs → Frequency`). This sub-observation is only accessible through the Social History section, not the Patient Data panel summary.'
package_name: telus.dw.emr.extract-1-1-21
derivation: constraint
name: DwObservationDrugUseFrequency
type: Observation
elements:
  category:
    pattern:
      type: CodeableConcept
      value: {text: social-history}
    index: 7
  referenceRange: {index: 24}
  meta:
    elements:
      lastUpdated: {mustSupport: true, index: 1}
      source: {mustSupport: true, index: 2}
      security: {mustSupport: true, index: 3}
    required: [lastUpdated]
  specimen: {index: 22}
  value:
    mustSupport: true
    choices: [valueString]
    index: 18
  valueString: {type: string, mustSupport: true, choiceOf: value, index: 19}
  note: {mustSupport: true, index: 20}
  status: {mustSupport: true, index: 6}
  effective:
    mustSupport: true
    choices: []
    index: 15
  id: {mustSupport: true, index: 0}
  code:
    mustSupport: true
    index: 8
    elements:
      coding:
        mustSupport: false
        index: 9
        elements:
          system: {mustSupport: false, index: 10}
          code: {mustSupport: false, index: 11}
      text: {mustSupport: true, index: 12}
  identifier: {mustSupport: true, index: 5}
  bodySite: {index: 21}
  device: {index: 23}
  subject:
    type: Reference
    mustSupport: true
    refers: ['https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwPatient']
    index: 13
  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: 16
  text: {mustSupport: true, index: 4}
package_version: 1.1.21
class: profile
kind: resource
url: https://www.telus.com/health/fhir/dwemrextract/StructureDefinition/DwObservationDrugUseFrequency
base: http://hl7.org/fhir/StructureDefinition/Observation
version: 2.0.0
required: [id, subject]