Lithuanian Laboratory Implementation Guide, published by Lithuanian Medical Library. This guide is not an authorized publication; it is the continuous build for version 0.0.1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7LT/ig-lt-lab/ and changes regularly. See the Directory of published versions

• Narrative Content
• XML
• JSON

: HER2 IHC Score

Draft as of 2026-03-29

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<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="her2-ihc-score"/>
  <language value="en"/>
  <text>
    <status value="generated"/>
    <div xml:lang="en" lang="en"><hr/><p><b>English</b></p><hr/><p class="res-header-id"><b>Generated Narrative: CodeSystem her2-ihc-score</b></p><a name="her2-ihc-score"> </a><a name="hcher2-ihc-score"> </a><div style="display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%"><p style="margin-bottom: 0px">Language: en</p></div><p>This case-sensitive code system <code>https://tx.hl7.lt/fhir/CodeSystem/her2-ihc-score</code> defines the following codes:</p><table class="codes"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td style="white-space:nowrap">0<a name="her2-ihc-score-0"> </a></td><td>HER2 0+ (negative)</td><td>HER2: expression absent (0)</td></tr><tr><td style="white-space:nowrap">1<a name="her2-ihc-score-1"> </a></td><td>HER2 1+ (low)</td><td>HER2: low immunohistochemical expression (1+)</td></tr><tr><td style="white-space:nowrap">2<a name="her2-ihc-score-2"> </a></td><td>HER2 2+ (borderline)</td><td>HER2: expression borderline (2+)</td></tr><tr><td style="white-space:nowrap">3<a name="her2-ihc-score-3"> </a></td><td>HER2 3+ (positive)</td><td>HER2: expression positive (3+)</td></tr></table></div>
  </text>
  <url value="https://tx.hl7.lt/fhir/CodeSystem/her2-ihc-score"/>
  <version value="0.0.1"/>
  <name value="Her2IhcScoreLtLab"/>
  <title value="HER2 IHC Score"/>
  <status value="draft"/>
  <experimental value="true"/>
  <date value="2026-03-29T11:59:27+00:00"/>
  <publisher value="Lithuanian Medical Library"/>
  <contact>
    <name value="Lithuanian Medical Library"/>
    <telecom>
      <system value="url"/>
      <value value="https://medicinosnk.lt"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="info@medicinosnk.lt"/>
    </telecom>
  </contact>
  <description value="HER2 immunohistochemical scoring system (0+ to 3+)."/>
  <jurisdiction>
    <coding>
      <system value="urn:iso:std:iso:3166"/>
      <code value="LT"/>
    </coding>
  </jurisdiction>
  <caseSensitive value="true"/>
  <content value="complete"/>
  <count value="4"/>
  <concept>
    <code value="0"/>
    <display value="HER2 0+ (negative)"/>
    <definition value="HER2: expression absent (0)"/>
  </concept>
  <concept>
    <code value="1"/>
    <display value="HER2 1+ (low)"/>
    <definition value="HER2: low immunohistochemical expression (1+)"/>
  </concept>
  <concept>
    <code value="2"/>
    <display value="HER2 2+ (borderline)"/>
    <definition value="HER2: expression borderline (2+)"/>
  </concept>
  <concept>
    <code value="3"/>
    <display value="HER2 3+ (positive)"/>
    <definition value="HER2: expression positive (3+)"/>
  </concept>
</CodeSystem>