description: DARC stands for 'Dates Affecting Readiness to Consult' and is defines as:\r\nPeriods of time between the referral and consult date when the patient is unavailable for a first consultation due to patient-related reasons. package_name: ca.on.oh derivation: constraint name: DARC type: Extension elements: extension: mustSupport: true index: 0 slicing: slices: StartDate: match: {} schema: mustSupport: true index: 0 elements: url: pattern: {type: Uri, value: StartDate} index: 1 value: choices: [valueDateTime] index: 3 valueDateTime: {type: dateTime, choiceOf: value, index: 4} EndDate: match: {} schema: mustSupport: true index: 5 elements: url: pattern: {type: Uri, value: EndDate} index: 6 value: choices: [valueDateTime] index: 8 valueDateTime: {type: dateTime, choiceOf: value, index: 9} DARCCodes: match: {} schema: mustSupport: true index: 10 elements: url: pattern: {type: Uri, value: DARCCodes} index: 11 value: choices: [valueCodeableConcept] index: 13 valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 14} value[x]: elements: coding: binding: {strength: extensible, valueSet: 'http://ehealthontario.ca/fhir/ValueSet/darc-dart-reason'} mustSupport: true index: 15 elements: system: pattern: {type: Uri, value: 'http://ehealthontario.ca/fhir/CodeSystem/darc-dart-reason'} mustSupport: true index: 16 code: {mustSupport: true, index: 17} display: {mustSupport: true, index: 18} url: pattern: {type: Uri, value: 'http://fhir.infoway-inforoute.ca/io/CA-eReC/StructureDefinition/DARC-EXT'} index: 19 value: label: To Date choices: [] index: 21 package_version: ereferral-econsult-0.12.0-projectathon1.0.2 extensions: StartDate: url: null mustSupport: true index: 0 elements: url: pattern: {type: Uri, value: StartDate} index: 1 value: choices: [valueDateTime] index: 3 valueDateTime: {type: dateTime, choiceOf: value, index: 4} EndDate: url: null mustSupport: true index: 5 elements: url: pattern: {type: Uri, value: EndDate} index: 6 value: choices: [valueDateTime] index: 8 valueDateTime: {type: dateTime, choiceOf: value, index: 9} DARCCodes: url: null mustSupport: true index: 10 elements: url: pattern: {type: Uri, value: DARCCodes} index: 11 value: choices: [valueCodeableConcept] index: 13 valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 14} value[x]: elements: coding: binding: {strength: extensible, valueSet: 'http://ehealthontario.ca/fhir/ValueSet/darc-dart-reason'} mustSupport: true index: 15 elements: system: pattern: {type: Uri, value: 'http://ehealthontario.ca/fhir/CodeSystem/darc-dart-reason'} mustSupport: true index: 16 code: {mustSupport: true, index: 17} display: {mustSupport: true, index: 18} class: extension kind: complex-type url: http://fhir.infoway-inforoute.ca/io/CA-eReC/StructureDefinition/DARC-EXT base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.11.0