<status value="draft" /> <fhirVersion value="4.0.0" /> <kind value="resource" /> <abstract value="false" /> <type value="Specimen" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Specimen" /> <derivation value="constraint" /> <differential> <element id="Specimen"> <path value="Specimen" /> </element> <element id="Specimen.extension"> <path value="Specimen.extension" /> <slicing> <discriminator> <type value="value" /> <path value="url" /> </discriminator> <ordered value="false" /> <rules value="open" /> </slicing> </element> <element id="Specimen.extension:age-at-event"> <path value="Specimen.extension" /> <sliceName value="age-at-event" /> <sliceIsConstraining value="false" /> <label value="age_at_event" /> <short value="Age at the time of Specimen collection" /> <definition value="Age (in days since birth) of the Kids First DRC Patient at the time of Specimen collection." /> <min value="0" /> <max value="1" /> <type> <code value="Extension" /> <profile value="http://fhir.kids-first.io/StructureDefinition/age-at-event" /> </type> <mustSupport value="true" /> <isModifier value="false" /> </element> <element id="Specimen.extension:concentration"> <path value="Specimen.extension" /> <sliceName value="concentration" /> <sliceIsConstraining value="false" /> <label value="concentration" /> <short value="Concentration" /> <definition value="Concentration of the Kids First DRC Specimen at the time of collection." /> <min value="0" /> <max value="1" /> <type> <code value="Extension" /> <profile value="http://fhir.kids-first.io/StructureDefinition/concentration" /> </type> <mustSupport value="true" /> <isModifier value="false" /> </element> </differential> </StructureDefinition>