{
  "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": "Last menstrual period start date"
      }
    ],
    "text": "Last menstrual period start date"
  },
  "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"
      }
    ]
  }
}