NHS North West Genomics
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: Histotrac Test Codes

Active as of 2026-09-04

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<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="Histotrac"/>
  <language value="en"/>
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: CodeSystem Histotrac</b></p><a name="Histotrac"> </a><a name="hcHistotrac"> </a><p><b>Properties</b></p><p><b>This code system defines the following properties for its concepts</b></p><table class="grid"><tr><td><b>Name</b></td><td><b>Code</b></td><td><b>URI</b></td><td><b>Type</b></td><td><b>Description</b></td></tr><tr><td>category</td><td>category</td><td>https://fhir.nhs.uk/CodeSystem/England-GenomicTestDirectory#category</td><td>code</td><td>Which part of the National Genomic Test Directory this code belongs to - reuses the same category values as CodeSystem-GenomicTestCode/CodeSystem-DigitalGenomicTestServices, plus histocompatibility-immunogenetics for codes outside that scheme</td></tr></table><p><b>Concepts</b></p><p>This case-sensitive code system <code>https://fhir.nwgenomics.nhs.uk/CodeSystem/Histotrac</code> provides <b>a fragment</b> that includes following codes:</p><table class="codes"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>category</b></td></tr><tr><td style="white-space:nowrap">XTRANSPX_HLAAS<a name="Histotrac-XTRANSPX_HLAAS"> </a></td><td>HLA ANTIBODY SCREENING</td><td>histocompatibility-immunogenetics</td></tr><tr><td style="white-space:nowrap">CHIMBTP<a name="Histotrac-CHIMBTP"> </a></td><td>CHIMERISM TESTING - PERFORMABLE</td><td>chimerism</td></tr></table></div>
  </text>
  <url value="https://fhir.nwgenomics.nhs.uk/CodeSystem/Histotrac"/>
  <version value="2.2.0"/>
  <name value="Histotrac"/>
  <title value="Histotrac Test Codes"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2026-09-04"/>
  <publisher value="NHS North West Genomics"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="https://www.nwgenomics.nhs.uk/contact-us"/>
    </telecom>
  </contact>
  <description
               value="Local test-order codes from **Histotrac**, the Histocompatibility and
Immunogenetics LIMS - see [Histocompatibility and
Immunogenetics](HistocompatibilityAndImmunogenetics.html), [HLA Tests -
Transplant Ask At Order Entry](Questionnaire-HLATestsTransplantAskAtOrderEntry.html)
and [Chimerism Test Additional Ask At Order Entry
Questions](Questionnaire-ChimerismTestAdditionalAskAtOrderQuestions.html). Sourced as HL7
v2 CE (coded element)-style `code^text^codingSystem` strings, both from the
`HISTOTRACEAP` coding system:

- `XTRANSPX_HLAAS^HLA ANTIBODY SCREENING^HISTOTRACEAP`
- `CHIMBTP^CHIMERISM TESTING - PERFORMABLE^HISTOTRACEAP`

These are the raw LIMS test-order codes, distinct from the local `NWGMSA`
answer options (e.g. `HLAAntibodyScreening`, `ChimerismPeripheralBlood`)
used on the Ask At Order Entry Questionnaires' own order-entry choice
items - those model the order-entry UI selection, these are what Histotrac
itself calls the resulting order."/>
  <jurisdiction>
    <coding>
      <system value="urn:iso:std:iso:3166"/>
      <code value="GB"/>
      <display value="United Kingdom of Great Britain and Northern Ireland"/>
    </coding>
  </jurisdiction>
  <caseSensitive value="true"/>
  <content value="fragment"/>
  <property>
    <code value="category"/>
    <uri
         value="https://fhir.nhs.uk/CodeSystem/England-GenomicTestDirectory#category"/>
    <description
                 value="Which part of the National Genomic Test Directory this code belongs to - reuses the same category values as CodeSystem-GenomicTestCode/CodeSystem-DigitalGenomicTestServices, plus histocompatibility-immunogenetics for codes outside that scheme"/>
    <type value="code"/>
  </property>
  <concept>
    <code value="XTRANSPX_HLAAS"/>
    <display value="HLA ANTIBODY SCREENING"/>
    <property>
      <code value="category"/>
      <valueCode value="histocompatibility-immunogenetics"/>
    </property>
  </concept>
  <concept>
    <code value="CHIMBTP"/>
    <display value="CHIMERISM TESTING - PERFORMABLE"/>
    <property>
      <code value="category"/>
      <valueCode value="chimerism"/>
    </property>
  </concept>
</CodeSystem>