<status value="active" /> <date value="2026-04-16" /> <publisher value="NHS England" /> <contact> <name value="NHS England" /> <telecom> <system value="email" /> <value value="interoperabilityteam@nhs.net" /> <use value="work" /> <rank value="1" /> </telecom> </contact> <description value="An Extension used to record the total number of participants in a group test request.(e.g. family, duo / trio)." /> <purpose value="This is a use case from Genomics, used to record the total number of participants in a family or group test request." /> <copyright value="Copyright © 2026+ NHS England Licensed under the Apache License, Version 2.0 (the \\\"License\\\"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an \\\"AS IS\\\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. HL7® FHIR® standard Copyright © 2011+ HL7 The HL7® FHIR® standard is used under the FHIR license. You may obtain a copy of the FHIR license at https://www.hl7.org/fhir/license.html." /> <fhirVersion value="4.0.1" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="RequestGroup" /> </context> <context> <type value="element" /> <expression value="ServiceRequest" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension.extension"> <path value="Extension.extension" /> <max value="0" /> </element> <element id="Extension.url"> <path value="Extension.url" /> <fixedUri value="https://fhir.nhs.uk/England/StructureDefinition/Extension-GenomicTest-ParticipantCount" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <type> <code value="integer" /> </type> </element> </differential> </StructureDefinition>