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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="reaction-event-certainty"/>
  <meta>
    <lastUpdated value="2020-04-09T21:10:28.568+00:00"/>
  </meta>
  <text>
    <status value="generated"/><div xmlns="http://www.w3.org/1999/xhtml"><p>This case-sensitive code system <code>http://terminology.hl7.org/CodeSystem/reaction-event-certainty</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">unlikely<a name="reaction-event-certainty-unlikely"> </a></td><td>Unlikely</td><td>There is a low level of clinical certainty that the reaction was caused by the identified substance.</td></tr><tr><td style="white-space:nowrap">likely<a name="reaction-event-certainty-likely"> </a></td><td>Likely</td><td>There is a high level of clinical certainty that the reaction was caused by the identified substance.</td></tr><tr><td style="white-space:nowrap">confirmed<a name="reaction-event-certainty-confirmed"> </a></td><td>Confirmed</td><td>There is a very high level of clinical certainty that the reaction was due to the identified substance, which may include clinical evidence by testing or rechallenge.</td></tr><tr><td style="white-space:nowrap">unknown<a name="reaction-event-certainty-unknown"> </a></td><td>Unknown</td><td>The clinical certainty that the reaction was caused by the identified substance is unknown.  It is an explicit assertion that certainty is not known.</td></tr></table></div>
  </text>
  <url value="http://terminology.hl7.org/CodeSystem/reaction-event-certainty"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.1.1276"/>
  </identifier>
  <version value="1.0.0"/>
  <name value="AllergyIntoleranceCertainty"/>
  <title value="AllergyIntoleranceCertainty"/>
  <status value="draft"/>
  <experimental value="false"/>
  <date value="2020-04-09T21:10:28+00:00"/>
  <publisher value="Health Level Seven International"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="hq@HL7.org"/>
    </telecom>
  </contact>
  <description value="Statement about the degree of clinical certainty that a specific substance was the cause of the manifestation in a reaction event."/>
  <copyright value="This material derives from the HL7 Terminology (THO). THO is copyright ©1989+ Health Level Seven International and is made available under the CC0 designation. For more licensing information see: https://terminology.hl7.org/license"/>
  <caseSensitive value="true"/>
  <valueSet value="http://terminology.hl7.org/ValueSet/reaction-event-certainty"/>
  <content value="complete"/>
  <concept>
    <code value="unlikely"/>
    <display value="Unlikely"/>
    <definition value="There is a low level of clinical certainty that the reaction was caused by the identified substance."/>
  </concept>
  <concept>
    <code value="likely"/>
    <display value="Likely"/>
    <definition value="There is a high level of clinical certainty that the reaction was caused by the identified substance."/>
  </concept>
  <concept>
    <code value="confirmed"/>
    <display value="Confirmed"/>
    <definition value="There is a very high level of clinical certainty that the reaction was due to the identified substance, which may include clinical evidence by testing or rechallenge."/>
  </concept>
  <concept>
    <code value="unknown"/>
    <display value="Unknown"/>
    <definition value="The clinical certainty that the reaction was caused by the identified substance is unknown.  It is an explicit assertion that certainty is not known."/>
  </concept>
</CodeSystem>