This code system http://hl7.org/fhir/research-subject-status defines the following codes:

CodeDisplayDefinition
candidateCandidateThe subject has been identified as a potential participant in the study but has not yet agreed to participate
enrolledEnrolledThe subject has agreed to participate in the study but has not yet begun performing any action within the study
activeActiveThe subject is currently being monitored and/or subject to treatment as part of the study
suspendedSuspendedThe subject has temporarily discontinued monitoring/treatment as part of the study
withdrawnWithdrawnThe subject has permanently ended participation in the study prior to completion of the intended monitoring/treatment
completedCompletedAll intended monitoring/treatment of the subject has been completed and their engagement with the study is now ended

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