{

"resourceType": "Observation",
"id": "date-lastmp",
"status": "final",
"category": [
  {
    "coding": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/observation-category",
        "code": "survey",
        "display": "Survey"
      }
    ],
    "text": "AOE"
  }
],
"code": {
  "coding": [
    {
      "system": "http://loinc.org",
      "code": "8665-2",
      "display": "Date last menstrual period"
    }
  ],
  "text": "Date last menstrual period"
},
"subject": {
  "reference": "Patient/pat2"
},
"effectiveDateTime": "2016-01-24",
"valueDateTime": "2016-12-30",
"meta": {
  "tag": [
    {
      "system": "http://terminology.hl7.org/CodeSystem/v3-ActReason",
      "code": "HTEST",
      "display": "test health data"
    }
  ]
}

}