This page is part of the FHIR Specification (v4.1.0: Release 4B Ballot #1). The current version which supercedes this version is 5.0.0.  For a full list of available versions, see the Directory of published versions  . Page versions: R5 R4B R4 R3
. Page versions: R5 R4B R4 R3
| Orders and Observations Work Group | Maturity Level: N/A | Standards Status: Informative | Compartments: Device, Encounter, Patient, Practitioner, RelatedPerson | 
Raw JSON (canonical form + also see JSON Format Specification)
An "ask at order" response using the datetime datetype for the result value
{
  "resourceType": "Observation",
  "id": "date-lastmp",
  "text": {
    "status": "generated",
    "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative</b></p><p/><p><b>category</b>: <span>AOE</span></p><p><b>code</b>: <span>Date last menstrual period</span></p><p><b>subject</b>: <a>Generated Summary: Medical record number: 123456 (USUAL); active; Duck D Donald (OFFICIAL); gender: other</a></p><p><b>effective</b>: 2016-01-24</p><p><b>value</b>: 2016-12-30</p></div>"
  },
  "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"
}
Usage note: every effort has been made to ensure that the examples are correct and useful, but they are not a normative part of the specification.