description: This extension applies to the Immunization resource and is used to represent the serial number of the vial of vaccine. Vial serial number is part of the [Australian Immunisation Register Rule 2015](https://www.legislation.gov.au/Latest/F2021C00234) data elements to report for COVID-19 vaccines.
package_name: hl7.fhir.au.base
derivation: constraint
name: VaccineSerialNumber
type: Extension
elements:
  url:
    pattern: {type: Uri, value: 'http://hl7.org.au/fhir/StructureDefinition/vaccine-serial-number'}
    index: 0
  value:
    choices: [valueString]
    index: 2
  valueString: {type: string, choiceOf: value, index: 3}
package_version: 4.2.2-preview
class: extension
kind: complex-type
url: http://hl7.org.au/fhir/StructureDefinition/vaccine-serial-number
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 4.2.2-preview
required: [valueString, value]