ResearchSubject resource (FHIR R4)

ResearchSubject is the FHIR R4 resource for a physical entity which is the primary unit of operational and/or administrative interest in a study.

Resource	ResearchSubject
FHIR version	R4 (4.0.1)
Canonical URL	http://hl7.org/fhir/StructureDefinition/ResearchSubject
Required elements	status (1..1), study (1..1), individual (1..1)

Example

{
  "resourceType": "ResearchSubject",
  "id": "researchsubject-c047f7767d4d288e94cd75b792287e60",
  "status": "candidate",
  "study": {
    "reference": "ResearchStudy/researchstudy-33ccc9c9c592f3a4168bd401981484cb"
  },
  "individual": {
    "reference": "Patient/patient-2c86afc1cd8648bc7948364268511ad5"
  }
}

Generated by the Pidgeon engine: pidgeon generate ResearchSubject --seed 20260722.

Validation context

strict pidgeon validate grades a ResearchSubject instance against the base R4 structure definition: missing required elements raise REQUIRED_FIELD_MISSING and cardinality violations raise CARDINALITY_MIN or CARDINALITY_MAX.(REQUIRED_FIELD_MISSING)

This answer, in your terminal

pidgeon lookup ResearchSubject

Wire it into your AI agent:

claude mcp add pidgeon -- npx -y @pidgeonhealth/mcp

Download Post free to browse this reference with generation attached.