{

"resourceType": "Observation",
"id": "example-TPMT-diplotype",
"extension": [
  {
    "url": "http://hl7.org/fhir/StructureDefinition/observation-geneticsGene",
    "valueCodeableConcept": {
      "coding": [
        {
          "system": "http://www.genenames.org",
          "code": "12014",
          "display": "TPMT"
        }
      ]
    }
  }
],
"status": "final",
"code": {
  "coding": [
    {
      "system": "http://snomed.info/sct",
      "code": "363779003",
      "display": "Genotype determination"
    }
  ],
  "text": "Diplotype Call"
},
"subject": {
  "reference": "Patient/example",
  "display": "E***********"
},
"issued": "2013-04-03T15:30:10+01:00",
"valueString": "*1/*4",
"derivedFrom": [
  {
    "reference": "Observation/example-TPMT-haplotype-one"
  },
  {
    "reference": "Observation/example-TPMT-haplotype-two"
  }
],
"meta": {
  "tag": [
    {
      "system": "http://terminology.hl7.org/CodeSystem/v3-ActReason",
      "code": "HTEST",
      "display": "test health data"
    }
  ]
}

}