ResearchStudy on the FHIR specification website.

A process where a researcher or organization plans and then executes a series of steps intended to increase the field of healthcare-related knowledge. This includes studies of safety, efficacy, comparative effectiveness and other information about medications, devices, therapies and other interventional and investigative techniques. A ResearchStudy involves the gathering of information about human or animal subjects.

The body should be a valid FHIR object for ResearchStudy.

Here is an example:

{
  "resourceType": "ResearchStudy",
  "id": "example",
  "text": {
    "status": "generated",
    "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\">[Put rendering here]</div>"
  },
  "status": "completed"
}

You can reference the FHIR documentation to determine the format for ResearchStudy.