<?xml version=“1.0” encoding=“UTF-8”?> <Observation xmlns=“hl7.org/fhir”>

      <id value="date-lastmp"/>
      <meta>
  <security>
    <system value="http://terminology.hl7.org/CodeSystem/v3-ActReason"/>
    <code value="HTEST"/>
    <display value="test health data"/>
  </security>
</meta>
<status value="final"/>
      <category>
              <coding>
                      <system value="http://terminology.hl7.org/CodeSystem/observation-category"/>
                      <code value="survey"/>
                      <display value="Survey"/>
              </coding>
              <text value="AOE"/>
      </category>
      <code>
              <coding>
                      <system value="http://loinc.org"/>
                      <code value="8665-2"/>
                      <display value="Date last menstrual period"/>
              </coding>
              <text value="Date last menstrual period"/>
      </code>
      <subject>
              <reference value="Patient/pat2"/>
      </subject>
      <effectiveDateTime value="2016-01-24"/>
      <valueDateTime value="2016-12-30"/>

</Observation>