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

      <id value="head-circumference"/>
      <meta>
              <profile value="http://hl7.org/fhir/StructureDefinition/vitalsigns"/>

  <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="vital-signs"/>
                      <display value="Vital Signs"/>
              </coding>
              <text value="Vital Signs"/>
      </category>
      <code>
              <coding>
                      <system value="http://loinc.org"/>
                      <code value="9843-4"/>
                      <display value="Head Occipital-frontal circumference"/>
              </coding>
              <text value="Head Circumference"/>
      </code>
      <subject>
              <reference value="Patient/example"/>
      </subject>
      <effectiveDateTime value="1999-07-02"/>
      <valueQuantity>
              <value value="51.2"/>
              <unit value="cm"/>
              <system value="http://unitsofmeasure.org"/>
              <code value="cm"/>
      </valueQuantity>

</Observation>