description: 'A region (or regions) that includes all of the sequence elements necessary to encode a functional transcript. A gene may include regulatory regions, transcribed regions and/or other functional sequence regions ([SO:0000704](http://www.sequenceontology.org/browser/current_svn/term/SO:0000704)). This element is the official gene symbol approved by the HGNC, which is a short abbreviated form of the gene name ([HGNC](http://www.genenames.org)). LONIC Code: ([48018-6](http://loinc.org/48018-6)).'
package_name: hl7.fhir.core
derivation: constraint
name: HGNC gene symbol
type: Extension
elements:
  extension:
    index: 0
    slicing:
      slices:
        extension:
          match: {}
          schema: {index: 0}
          max: 0
  url:
    type: uri
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/observation-geneticsGene'}
    index: 1
  value:
    choices: [valueCodeableConcept]
    index: 3
  valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 4}
package_version: 1.8.0
extensions:
  extension: {url: null, max: 0, index: 0}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/observation-geneticsGene
base: http://hl7.org/fhir/StructureDefinition/Extension
version: null
required: [value, valueCodeableConcept]