# AIR Antigen Group Extension - Aotearoa Immunisation Register (AIR) FHIR Implementation Guide v2.1.0

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **AIR Antigen Group Extension**

## Extension: AIR Antigen Group Extension 

| | |
| :--- | :--- |
| *Official URL*:https://standards.digital.health.nz/fhir/air/StructureDefinition/air-antigen-group-extension | *Version*:2.1.0 |
| Active as of 2026-07-21 | *Computable Name*:air-antigen-group-extension |

Describes the antigen group used in AGVS.

**Context of Use**

**Usage info**

**Usages:**

* Use this Extension: [Immunization Schedule Plan Definition](StructureDefinition-air-agvs-plan-definition.md)

You can also check for [usages in the FHIR IG Statistics](https://packages2.fhir.org/xig/resource/AIR-ig|current/StructureDefinition/StructureDefinition-air-antigen-group-extension.json)

### 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-air-antigen-group-extension.csv), [Excel](StructureDefinition-air-antigen-group-extension.xlsx), [Schematron](StructureDefinition-air-antigen-group-extension.sch) 

#### Constraints



## Resource Content

```json
{
  "resourceType" : "StructureDefinition",
  "id" : "air-antigen-group-extension",
  "url" : "https://standards.digital.health.nz/fhir/air/StructureDefinition/air-antigen-group-extension",
  "version" : "2.1.0",
  "name" : "air-antigen-group-extension",
  "title" : "AIR Antigen Group Extension",
  "status" : "active",
  "date" : "2026-07-21T20:59:11+00:00",
  "publisher" : "Te Whatu Ora",
  "contact" : [{
    "name" : "Te Whatu Ora",
    "telecom" : [{
      "system" : "url",
      "value" : "https://tewhatuora.govt.nz"
    }]
  }],
  "description" : "Describes the antigen group used in AGVS.",
  "jurisdiction" : [{
    "coding" : [{
      "system" : "urn:iso:std:iso:3166",
      "code" : "US",
      "display" : "New Zealand"
    }]
  }],
  "fhirVersion" : "4.0.1",
  "mapping" : [{
    "identity" : "rim",
    "uri" : "http://hl7.org/v3",
    "name" : "RIM Mapping"
  }],
  "kind" : "complex-type",
  "abstract" : false,
  "context" : [{
    "type" : "element",
    "expression" : "Element"
  }],
  "type" : "Extension",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation" : "constraint",
  "differential" : {
    "element" : [{
      "id" : "Extension",
      "path" : "Extension",
      "short" : "AIR Antigen Group Extension",
      "definition" : "Describes the antigen group used in AGVS."
    },
    {
      "id" : "Extension.url",
      "path" : "Extension.url",
      "fixedUri" : "https://standards.digital.health.nz/fhir/air/StructureDefinition/air-antigen-group-extension",
      "mustSupport" : true
    },
    {
      "id" : "Extension.value[x]",
      "path" : "Extension.value[x]",
      "slicing" : {
        "discriminator" : [{
          "type" : "type",
          "path" : "$this"
        }],
        "ordered" : false,
        "rules" : "open"
      }
    },
    {
      "id" : "Extension.value[x]:valueCoding",
      "path" : "Extension.value[x]",
      "sliceName" : "valueCoding",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "Coding"
      }]
    },
    {
      "id" : "Extension.value[x]:valueCoding.system",
      "path" : "Extension.value[x].system",
      "min" : 1,
      "mustSupport" : true
    },
    {
      "id" : "Extension.value[x]:valueCoding.code",
      "path" : "Extension.value[x].code",
      "min" : 1,
      "mustSupport" : true
    },
    {
      "id" : "Extension.value[x]:valueCoding.display",
      "path" : "Extension.value[x].display",
      "min" : 1,
      "mustSupport" : true
    }]
  }
}

```
