<?xml version="1.0" encoding="UTF-8"?>

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="protein-modification-type"/>
  <meta>
    <lastUpdated value="2026-07-04T18:53:58.933+00:00"/>
  </meta>
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml">
      <p class="res-header-id">
        <b>Generated Narrative: CodeSystem protein-modification-type</b>
      </p>
      <a name="protein-modification-type"> </a>
      <a name="hcprotein-modification-type"> </a>
      <p>This case-sensitive code system 
        <code>http://hl7.org/fhir/protein-modification-type</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">PEGylated
            <a name="protein-modification-type-PEGylated"> </a>
          </td>
          <td>PEGylated</td>
          <td>Conjugated to one or more polyethylene glycol (PEG) chains for half-life extension. Examples: pegfilgrastim, peginterferon, certolizumab pegol.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">lipidated
            <a name="protein-modification-type-lipidated"> </a>
          </td>
          <td>Lipidated</td>
          <td>Conjugated to a fatty acid chain (acylation) for half-life extension via albumin binding. Examples: semaglutide, liraglutide, insulin detemir, insulin degludec.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">Fc-fused
            <a name="protein-modification-type-Fc-fused"> </a>
          </td>
          <td>Fc fusion</td>
          <td>Fused to an immunoglobulin Fc region for half-life extension and effector function. Examples: etanercept, abatacept, aflibercept, dulaglutide.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">albumin-fused
            <a name="protein-modification-type-albumin-fused"> </a>
          </td>
          <td>Albumin fusion</td>
          <td>Fused to human serum albumin for half-life extension. Example: albiglutide.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">drug-conjugated
            <a name="protein-modification-type-drug-conjugated"> </a>
          </td>
          <td>Drug-conjugated (ADC)</td>
          <td>Conjugated to a small-molecule drug payload via a linker (antibody-drug conjugate). Examples: trastuzumab emtansine, brentuximab vedotin, gemtuzumab ozogamicin.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">polysaccharide-conjugated
            <a name="protein-modification-type-polysaccharide-conjugated"> </a>
          </td>
          <td>Polysaccharide-conjugated</td>
          <td>Conjugated to a polysaccharide antigen for vaccine immunogenicity. Examples: Hib, pneumococcal and meningococcal conjugate vaccines.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">glycoengineered
            <a name="protein-modification-type-glycoengineered"> </a>
          </td>
          <td>Glycoengineered</td>
          <td>Glycan structure engineered (e.g. afucosylated) to alter biological activity. Examples: obinutuzumab, mogamulizumab (enhanced ADCC).</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">amino-acid-substituted
            <a name="protein-modification-type-amino-acid-substituted"> </a>
          </td>
          <td>Amino acid substituted</td>
          <td>Sequence carries one or more amino acid substitutions relative to a natural or parent protein. Examples: insulin analogs lispro, aspart, glargine.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">truncated
            <a name="protein-modification-type-truncated"> </a>
          </td>
          <td>Truncated</td>
          <td>Sequence is shortened relative to the parent protein.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">biotinylated
            <a name="protein-modification-type-biotinylated"> </a>
          </td>
          <td>Biotinylated</td>
          <td>Covalently labelled with biotin. Typical for research or diagnostic reagents.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">fluorescent-labeled
            <a name="protein-modification-type-fluorescent-labeled"> </a>
          </td>
          <td>Fluorescent labelled</td>
          <td>Covalently labelled with a fluorescent dye. Typical for imaging or flow-cytometry reagents.</td>
        </tr>
      </table>
    </div>
  </text>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="brr"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="informative"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="1"/>
  </extension>
  <url value="http://hl7.org/fhir/protein-modification-type"/>
  <version value="6.0.0-ballot4"/>
  <name value="ProteinModificationTypeExample"/>
  <title value="Protein Modification Type"/>
  <status value="active"/>
  <experimental value="true"/>
  <date value="2026-06-30"/>
  <publisher value="HL7 (FHIR Project)"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org/fhir"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="fhir@lists.hl7.org"/>
    </telecom>
  </contact>
  <description value="A high-level summary of how a protein has been modified, e.g. PEGylation, lipidation, Fc fusion. Useful for categorising modified biologics without enumerating the detailed chemistry."/>
  <jurisdiction>
    <coding>
      <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/>
      <code value="001"/>
      <display value="World"/>
    </coding>
  </jurisdiction>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/protein-modification-type"/>
  <content value="complete"/>
  <concept>
    <code value="PEGylated"/>
    <display value="PEGylated"/>
    <definition value="Conjugated to one or more polyethylene glycol (PEG) chains for half-life extension. Examples: pegfilgrastim, peginterferon, certolizumab pegol."/>
  </concept>
  <concept>
    <code value="lipidated"/>
    <display value="Lipidated"/>
    <definition value="Conjugated to a fatty acid chain (acylation) for half-life extension via albumin binding. Examples: semaglutide, liraglutide, insulin detemir, insulin degludec."/>
  </concept>
  <concept>
    <code value="Fc-fused"/>
    <display value="Fc fusion"/>
    <definition value="Fused to an immunoglobulin Fc region for half-life extension and effector function. Examples: etanercept, abatacept, aflibercept, dulaglutide."/>
  </concept>
  <concept>
    <code value="albumin-fused"/>
    <display value="Albumin fusion"/>
    <definition value="Fused to human serum albumin for half-life extension. Example: albiglutide."/>
  </concept>
  <concept>
    <code value="drug-conjugated"/>
    <display value="Drug-conjugated (ADC)"/>
    <definition value="Conjugated to a small-molecule drug payload via a linker (antibody-drug conjugate). Examples: trastuzumab emtansine, brentuximab vedotin, gemtuzumab ozogamicin."/>
  </concept>
  <concept>
    <code value="polysaccharide-conjugated"/>
    <display value="Polysaccharide-conjugated"/>
    <definition value="Conjugated to a polysaccharide antigen for vaccine immunogenicity. Examples: Hib, pneumococcal and meningococcal conjugate vaccines."/>
  </concept>
  <concept>
    <code value="glycoengineered"/>
    <display value="Glycoengineered"/>
    <definition value="Glycan structure engineered (e.g. afucosylated) to alter biological activity. Examples: obinutuzumab, mogamulizumab (enhanced ADCC)."/>
  </concept>
  <concept>
    <code value="amino-acid-substituted"/>
    <display value="Amino acid substituted"/>
    <definition value="Sequence carries one or more amino acid substitutions relative to a natural or parent protein. Examples: insulin analogs lispro, aspart, glargine."/>
  </concept>
  <concept>
    <code value="truncated"/>
    <display value="Truncated"/>
    <definition value="Sequence is shortened relative to the parent protein."/>
  </concept>
  <concept>
    <code value="biotinylated"/>
    <display value="Biotinylated"/>
    <definition value="Covalently labelled with biotin. Typical for research or diagnostic reagents."/>
  </concept>
  <concept>
    <code value="fluorescent-labeled"/>
    <display value="Fluorescent labelled"/>
    <definition value="Covalently labelled with a fluorescent dye. Typical for imaging or flow-cytometry reagents."/>
  </concept>
</CodeSystem>