# Off label - HL7® FHIR® Te Aho o Te Kahu, Cancer Control Agency Implementation Guide v0.1.0

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **Off label**

## Extension: Off label 

| | |
| :--- | :--- |
| *Official URL*:http://hl7.org.nz/fhir/StructureDefinition/sact-off-label | *Version*:0.1.0 |
| Active as of 2026-05-21 | *Computable Name*:OffLabel |

Indicates that the medication is being used for a purpose for which it has not been specifically approved

**Context of Use**

**Usage info**

**Usages:**

* Use this Extension: [ActivityDefinition](StructureDefinition-CcaActivityDefinition.md) and [PlanDefinition](StructureDefinition-CcaPlanDefinition.md)
* Examples for this Extension: [ActivityDefinition/ActCabergoline](ActivityDefinition-ActCabergoline.md), [LUNG NSCLC Metastatic - alectinib](PlanDefinition-52331000210102.md), [LUNG NSCLC NON-Metastatic - alectinib](PlanDefinition-52401000210103.md), [GU PROS Castration resistant Metastatic - abiraterone and dexamethasone](PlanDefinition-52451000210102.md) and [GYN END Adjuvant - cISplatin chemoradiation followed by cARBOplatin and PACLItaxel](PlanDefinition-60071000210106.md)

You can also check for [usages in the FHIR IG Statistics](https://packages2.fhir.org/xig/hl7.org.nz.fhir.ig.cca|current/StructureDefinition/sact-off-label)

### Formal Views of Extension Content

 [Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work](http://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#structure-definitions). 

 

Other representations of profile: [CSV](StructureDefinition-sact-off-label.csv), [Excel](StructureDefinition-sact-off-label.xlsx), [Schematron](StructureDefinition-sact-off-label.sch) 

#### Constraints



## Resource Content

```json
{
  "resourceType" : "StructureDefinition",
  "id" : "sact-off-label",
  "url" : "http://hl7.org.nz/fhir/StructureDefinition/sact-off-label",
  "version" : "0.1.0",
  "name" : "OffLabel",
  "title" : "Off label",
  "status" : "active",
  "date" : "2026-05-21T02:29:02+00:00",
  "publisher" : "Te Aho o Te Kahu, Cancer Control Agency",
  "description" : "Indicates that the medication is being used for a purpose for which it has not been specifically approved",
  "fhirVersion" : "4.0.1",
  "mapping" : [{
    "identity" : "rim",
    "uri" : "http://hl7.org/v3",
    "name" : "RIM Mapping"
  }],
  "kind" : "complex-type",
  "abstract" : false,
  "context" : [{
    "type" : "element",
    "expression" : "ActivityDefinition"
  }],
  "type" : "Extension",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation" : "constraint",
  "differential" : {
    "element" : [{
      "id" : "Extension",
      "path" : "Extension",
      "short" : "Off label",
      "definition" : "Indicates that the medication is being used for a purpose for which it has not been specifically approved"
    },
    {
      "id" : "Extension.extension",
      "path" : "Extension.extension",
      "max" : "0"
    },
    {
      "id" : "Extension.url",
      "path" : "Extension.url",
      "fixedUri" : "http://hl7.org.nz/fhir/StructureDefinition/sact-off-label"
    },
    {
      "id" : "Extension.value[x]",
      "path" : "Extension.value[x]",
      "type" : [{
        "code" : "boolean"
      }]
    }]
  }
}

```
