GET/transactional-api/research/study-participants/:studyId

List Research Study Participants

Returns the patients currently taking part in a research study. A participation that has ended is not returned, so a participant stops appearing as soon as their participation is ended.

Authorization: Bearer token (JWT). See Authentication.

Request

curl -L -X GET 'https://{tenantId}.api.england.medicus.health/transactional-api/research/study-participants/3fa85f64-5717-4562-b3fc-2c963f66afa6' \
  -H 'Accept: application/json' \
  -H 'Authorization: Bearer <token>'

Path and query parameters

Name	In	Type	Required	Description
studyId	path	string<uuid>	Yes	The id of the research study, as returned by List Research Studies.

Responses

200 Participants whose participation is ongoing.

[
  {
    "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "patientId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "participantIdentifier": "ABC-0061",
    "randomisationNumber": "R-0042",
    "participationStartedDateTime": "2026-06-01T09:00:00+00:00",
    "enrolledDateTime": "2026-06-01T09:00:00+00:00"
  }
]

404 Research study not found.

Response fields

Field	Type	Description
errors[].code	string
errors[].description	string

{
  "errors": [
    {
      "code": "research-study-not-found",
      "description": "Research study not found for id: 3fa85f64-5717-4562-b3fc-2c963f66afa6"
    }
  ]
}