# ResearchDefinition ## Get FHIR r4 research definitions - [GET /site/{siteId}/fhir/research-definition](https://docs.heydonto.com/apis/fhir/openapi/researchdefinition/fhirresearchdefinitioncontroller_getresearchdefinitions.md) ## Create FHIR r4 research definition - [POST /site/{siteId}/fhir/research-definition](https://docs.heydonto.com/apis/fhir/openapi/researchdefinition/fhirresearchdefinitioncontroller_createresearchdefinition.md) ## Get FHIR r4 research definition by ID - [GET /site/{siteId}/fhir/research-definition/{id}](https://docs.heydonto.com/apis/fhir/openapi/researchdefinition/fhirresearchdefinitioncontroller_getresearchdefinition.md) ## Update FHIR r4 research definition - [PUT /site/{siteId}/fhir/research-definition/{id}](https://docs.heydonto.com/apis/fhir/openapi/researchdefinition/fhirresearchdefinitioncontroller_updateresearchdefinition.md) ## Delete FHIR r4 research definition - [DELETE /site/{siteId}/fhir/research-definition/{id}](https://docs.heydonto.com/apis/fhir/openapi/researchdefinition/fhirresearchdefinitioncontroller_deleteresearchdefinition.md) ## Get FHIR r4 research definition history by ID - [GET /site/{siteId}/fhir/research-definition/{id}/history](https://docs.heydonto.com/apis/fhir/openapi/researchdefinition/fhirresearchdefinitioncontroller_getresearchdefinitionhistory.md)