# AU eRequesting Fasting Precondition - AU eRequesting Implementation Guide v1.0.0-ci-build

* [**Table of Contents**](toc.md)
* [**FHIR Artefacts**](fhirartifacts.md)
* [**Artefacts Summary**](artifacts.md)
* **AU eRequesting Fasting Precondition**

##  Extension: AU eRequesting Fasting Precondition 

| | | |
| :--- | :--- | :--- |
| *Official URL*:http://hl7.org.au/fhir/ereq/StructureDefinition/au-erequesting-fastingprecondition | *Version*:1.0.0-ci-build | |
| *Standards status:*[Draft](http://hl7.org/fhir/R4/versions.html#std-process) | [Maturity Level](https://build.fhir.org/ig/hl7au/au-fhir-base/generalguidance.html#maturity-levels): 1 | *Computable Name*:AUeRequestingFastingPrecondition |
| **Copyright/Legal**: Used by permission of HL7 International, all rights reserved Creative Commons License. HL7 Australia© 2024+; Licensed Under Creative Commons No Rights Reserved. | | |

This extension applies to the ServiceRequest resource and is used to represent whether fasting is a recommended precondition for the diagnostic request. It conveys the requester’s recommendation regarding fasting at the time of ordering, not the actual fasting status of the patient.

This extension may be used on the following element(s):

* Element ID ServiceRequest

**Usages:**

* Use this Extension: [AU eRequesting Diagnostic Request](StructureDefinition-au-erequesting-diagnosticrequest.md)
* Examples for this Extension: [ServiceRequest/order-glu-1](ServiceRequest-order-glu-1.md) and [ServiceRequest/order-urinemcs-1](ServiceRequest-order-urinemcs-1.md)

You can also check for [usages in the FHIR IG Statistics](https://packages2.fhir.org/xig/hl7.fhir.au.ereq|current/StructureDefinition/au-erequesting-fastingprecondition)

**Changes since version 1.0.0-ballot:**

* The resource metadata has changed (description)

* The data elements list has changed

* One or more text definitions, invariants or bindings have changed

### Formal Views of Extension Content

 [Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work](http://hl7.org/fhir/R4/profiling.html#representation). 

 

 Other representations of profile: [CSV](StructureDefinition-au-erequesting-fastingprecondition.csv), [Excel](StructureDefinition-au-erequesting-fastingprecondition.xlsx), [Schematron](StructureDefinition-au-erequesting-fastingprecondition.sch) 

#### Terminology Bindings

#### Constraints



## Resource Content

```json
{
  "resourceType" : "StructureDefinition",
  "id" : "au-erequesting-fastingprecondition",
  "extension" : [
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger" : 1
    },
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode" : "draft",
      "_valueCode" : {
        "extension" : [
          {
            "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueCanonical" : "http://hl7.org.au/fhir/ereq/ImplementationGuide/hl7.fhir.au.ereq"
          }
        ]
      }
    }
  ],
  "url" : "http://hl7.org.au/fhir/ereq/StructureDefinition/au-erequesting-fastingprecondition",
  "version" : "1.0.0-ci-build",
  "name" : "AUeRequestingFastingPrecondition",
  "title" : "AU eRequesting Fasting Precondition",
  "status" : "active",
  "date" : "2025-10-20T07:23:52+00:00",
  "publisher" : "HL7 Australia",
  "contact" : [
    {
      "name" : "HL7 Australia",
      "telecom" : [
        {
          "system" : "url",
          "value" : "https://confluence.hl7.org/display/HAFWG"
        }
      ]
    },
    {
      "name" : "HL7 Australia FHIR Work Group",
      "telecom" : [
        {
          "system" : "url",
          "value" : "https://confluence.hl7.org/display/HAFWG",
          "use" : "work"
        }
      ]
    }
  ],
  "description" : "This extension applies to the ServiceRequest resource and is used to represent whether fasting is a recommended precondition for the diagnostic request. It conveys the requester's recommendation regarding fasting at the time of ordering, not the actual fasting status of the patient.",
  "jurisdiction" : [
    {
      "coding" : [
        {
          "system" : "urn:iso:std:iso:3166",
          "code" : "AU"
        }
      ]
    }
  ],
  "copyright" : "Used by permission of HL7 International, all rights reserved Creative Commons License. HL7 Australia© 2024+; Licensed Under Creative Commons No Rights Reserved.",
  "fhirVersion" : "4.0.1",
  "mapping" : [
    {
      "identity" : "rim",
      "uri" : "http://hl7.org/v3",
      "name" : "RIM Mapping"
    }
  ],
  "kind" : "complex-type",
  "abstract" : false,
  "context" : [
    {
      "type" : "element",
      "expression" : "ServiceRequest"
    }
  ],
  "type" : "Extension",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation" : "constraint",
  "differential" : {
    "element" : [
      {
        "id" : "Extension",
        "path" : "Extension",
        "short" : "Fasting precondition",
        "definition" : "This extension applies to the ServiceRequest resource and is used to represent whether fasting is a recommended precondition for the diagnostic request. It conveys the requester's recommendation regarding fasting at the time of ordering, not the actual fasting status of the patient."
      },
      {
        "id" : "Extension.extension",
        "path" : "Extension.extension",
        "max" : "0"
      },
      {
        "id" : "Extension.url",
        "path" : "Extension.url",
        "fixedUri" : "http://hl7.org.au/fhir/ereq/StructureDefinition/au-erequesting-fastingprecondition"
      },
      {
        "id" : "Extension.value[x]",
        "path" : "Extension.value[x]",
        "min" : 1,
        "type" : [
          {
            "code" : "CodeableConcept"
          }
        ],
        "binding" : {
          "strength" : "required",
          "valueSet" : "https://healthterminologies.gov.au/fhir/ValueSet/pathology-fasting-status-1"
        }
      }
    ]
  }
}

```
