# SubstanceSpecification ## Get FHIR r4 substance specifications - [GET /site/{siteId}/fhir/substance-specification](https://docs.heydonto.com/apis/fhir/openapi/substancespecification/fhirsubstancespecificationcontroller_getsubstancespecifications.md) ## Create FHIR r4 substance specification - [POST /site/{siteId}/fhir/substance-specification](https://docs.heydonto.com/apis/fhir/openapi/substancespecification/fhirsubstancespecificationcontroller_createsubstancespecification.md) ## Get FHIR r4 substance specification by ID - [GET /site/{siteId}/fhir/substance-specification/{id}](https://docs.heydonto.com/apis/fhir/openapi/substancespecification/fhirsubstancespecificationcontroller_getsubstancespecification.md) ## Update FHIR r4 substance specification - [PUT /site/{siteId}/fhir/substance-specification/{id}](https://docs.heydonto.com/apis/fhir/openapi/substancespecification/fhirsubstancespecificationcontroller_updatesubstancespecification.md) ## Delete FHIR r4 substance specification - [DELETE /site/{siteId}/fhir/substance-specification/{id}](https://docs.heydonto.com/apis/fhir/openapi/substancespecification/fhirsubstancespecificationcontroller_deletesubstancespecification.md) ## Get FHIR r4 substance specification history by ID - [GET /site/{siteId}/fhir/substance-specification/{id}/history](https://docs.heydonto.com/apis/fhir/openapi/substancespecification/fhirsubstancespecificationcontroller_getsubstancespecificationhistory.md)