{"caseSensitive":true,"concept":[{"code":"ic50","definition":"Half maximal inhibitory concentration.","display":"IC50"},{"code":"ec50","definition":"Half maximal effective concentration.","display":"EC50"},{"code":"kd","definition":"Equilibrium dissociation constant.","display":"Kd"},{"code":"ki","definition":"Inhibition constant.","display":"Ki"},{"code":"km","definition":"Michaelis constant.","display":"Km"},{"code":"kon","definition":"Association rate constant.","display":"Kon"},{"code":"koff","definition":"Dissociation rate constant.","display":"Koff"},{"code":"mole-ratio","definition":"Ratio expressed in moles.","display":"Mole ratio"},{"code":"weight-ratio","definition":"Ratio expressed by weight (mass).","display":"Weight ratio"}],"contact":[{"telecom":[{"system":"url","value":"http://hl7.org/fhir"},{"system":"email","value":"fhir@lists.hl7.org"}]}],"content":"complete","date":"2026-06-23","description":"The kind of numeric measurement being recorded for a substance amount or relationship, e.g. IC50, Kd, mole ratio.","experimental":true,"extension":[{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-wg","valueCode":"brr"},{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status","valueCode":"informative"},{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm","valueInteger":1}],"id":"substance-measurement-type","jurisdiction":[{"coding":[{"code":"001","display":"World","system":"http://unstats.un.org/unsd/methods/m49/m49.htm"}]}],"meta":{"lastUpdated":"2026-06-23T16:20:19.822+00:00"},"name":"SubstanceMeasurementTypeExample","publisher":"HL7 (FHIR Project)","resourceType":"CodeSystem","status":"active","text":{"div":"<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>","status":"generated"},"title":"Substance Measurement Type","url":"http://hl7.org/fhir/substance-measurement-type","valueSet":"http://hl7.org/fhir/ValueSet/substance-measurement-type","version":"6.0.0-ballot4"}