description: This extension applies to the AU eRequesting Diagnostic Request profile and any derived ServiceRequest profiles. The fasting precondition is a code that indicates the recommendation related to the fasting status of the patient as a precondition to the diagnostic procedure or test being requested. package_name: hl7.fhir.au.ereq derivation: constraint name: AUeRequestingFastingPrecondition type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org.au/fhir/ereq/StructureDefinition/au-erequesting-fastingprecondition'} type: uri index: 1 value: choices: [valueCodeableConcept] index: 3 valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 4} package_version: 0.4.0-preview extensions: {} class: extension kind: complex-type url: http://hl7.org.au/fhir/ereq/StructureDefinition/au-erequesting-fastingprecondition base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.4.0-preview required: [value, valueCodeableConcept]