Using CQL with FHIR
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Using CQL with FHIR, published by HL7 International / Clinical Decision Support. This guide is not an authorized publication; it is the continuous build for version 2.0.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/cql-ig/ and changes regularly. See the Directory of published versions

: Example Negation Observation - XML Representation

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<Observation xmlns="http://hl7.org/fhir">
  <id value="negation-example"/>
  <text>
    <status value="extensions"/>
    <div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: Observation negation-example</b></p><a name="negation-example"> </a><a name="hcnegation-example"> </a><a name="negation-example-en-US"> </a><p><b>status</b>: Cancelled</p><p><b>category</b>: <span title="Codes:{http://terminology.hl7.org/CodeSystem/observation-category laboratory}">Laboratory</span></p><p><b>code</b>: <span title="Codes:">Not Done Value Set: Hemoglobin lab test</span> (Not done value set: <code>http://cts.nlm.nih.gov/fhir/2.16.840.1.113762.1.4.1045.131</code>)</p><p><b>subject</b>: <a href="Patient-example.html">Alana Asdf  (no stated gender), DoB: 1993-06-14</a></p><p><b>effective</b>: 2013-04-02 10:30:10+0100 --&gt; 2013-04-05 10:30:10+0100</p><p><b>issued</b>: 2013-04-03 15:30:10+0100</p></div>
  </text>
  <status value="cancelled"/>
  <category>
    <coding>
      <system
              value="http://terminology.hl7.org/CodeSystem/observation-category"/>
      <code value="laboratory"/>
      <display value="Laboratory"/>
    </coding>
  </category>
  <code>
    <extension
               url="http://hl7.org/fhir/StructureDefinition/cqf-notDoneValueSet">
      <valueCanonical
                      value="http://cts.nlm.nih.gov/fhir/2.16.840.1.113762.1.4.1045.131"/>
    </extension>
    <text value="Not Done Value Set: Hemoglobin lab test"/>
  </code>
  <subject>🔗 
    <reference value="Patient/example"/>
  </subject>
  <effectivePeriod>
    <start value="2013-04-02T10:30:10+01:00"/>
    <end value="2013-04-05T10:30:10+01:00"/>
  </effectivePeriod>
  <issued value="2013-04-03T15:30:10+01:00"/>
</Observation>