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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="substance-measurement-type"/>
  <meta>
    <lastUpdated value="2026-06-23T16:20:19.822+00:00"/>
  </meta>
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml">
      <p class="res-header-id">
        <b>Generated Narrative: CodeSystem substance-measurement-type</b>
      </p>
      <a name="substance-measurement-type"> </a>
      <a name="hcsubstance-measurement-type"> </a>
      <p>This case-sensitive code system 
        <code>http://hl7.org/fhir/substance-measurement-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">ic50
            <a name="substance-measurement-type-ic50"> </a>
          </td>
          <td>IC50</td>
          <td>Half maximal inhibitory concentration.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">ec50
            <a name="substance-measurement-type-ec50"> </a>
          </td>
          <td>EC50</td>
          <td>Half maximal effective concentration.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">kd
            <a name="substance-measurement-type-kd"> </a>
          </td>
          <td>Kd</td>
          <td>Equilibrium dissociation constant.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">ki
            <a name="substance-measurement-type-ki"> </a>
          </td>
          <td>Ki</td>
          <td>Inhibition constant.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">km
            <a name="substance-measurement-type-km"> </a>
          </td>
          <td>Km</td>
          <td>Michaelis constant.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">kon
            <a name="substance-measurement-type-kon"> </a>
          </td>
          <td>Kon</td>
          <td>Association rate constant.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">koff
            <a name="substance-measurement-type-koff"> </a>
          </td>
          <td>Koff</td>
          <td>Dissociation rate constant.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">mole-ratio
            <a name="substance-measurement-type-mole-ratio"> </a>
          </td>
          <td>Mole ratio</td>
          <td>Ratio expressed in moles.</td>
        </tr>
        <tr>
          <td style="white-space:nowrap">weight-ratio
            <a name="substance-measurement-type-weight-ratio"> </a>
          </td>
          <td>Weight ratio</td>
          <td>Ratio expressed by weight (mass).</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/substance-measurement-type"/>
  <version value="6.0.0-ballot4"/>
  <name value="SubstanceMeasurementTypeExample"/>
  <title value="Substance Measurement Type"/>
  <status value="active"/>
  <experimental value="true"/>
  <date value="2026-06-23"/>
  <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="The kind of numeric measurement being recorded for a substance amount or relationship, e.g. IC50, Kd, mole ratio."/>
  <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/substance-measurement-type"/>
  <content value="complete"/>
  <concept>
    <code value="ic50"/>
    <display value="IC50"/>
    <definition value="Half maximal inhibitory concentration."/>
  </concept>
  <concept>
    <code value="ec50"/>
    <display value="EC50"/>
    <definition value="Half maximal effective concentration."/>
  </concept>
  <concept>
    <code value="kd"/>
    <display value="Kd"/>
    <definition value="Equilibrium dissociation constant."/>
  </concept>
  <concept>
    <code value="ki"/>
    <display value="Ki"/>
    <definition value="Inhibition constant."/>
  </concept>
  <concept>
    <code value="km"/>
    <display value="Km"/>
    <definition value="Michaelis constant."/>
  </concept>
  <concept>
    <code value="kon"/>
    <display value="Kon"/>
    <definition value="Association rate constant."/>
  </concept>
  <concept>
    <code value="koff"/>
    <display value="Koff"/>
    <definition value="Dissociation rate constant."/>
  </concept>
  <concept>
    <code value="mole-ratio"/>
    <display value="Mole ratio"/>
    <definition value="Ratio expressed in moles."/>
  </concept>
  <concept>
    <code value="weight-ratio"/>
    <display value="Weight ratio"/>
    <definition value="Ratio expressed by weight (mass)."/>
  </concept>
</CodeSystem>