| Code | Display | Definition |
| candidate | Candidate | A subject (ResearchSubject) potentially eligible for participation in a study (ResearchStudy) who has not completed an evaluation to determine whether they are eligible or ineligible for consideration.
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| in-prescreening | In-Prescreening | A subject (ResearchSubject) potentially eligible for participation in a study (ResearchStudy) who has not completed an evaluation to determine whether they are eligible or ineligible for consideration.
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| in-screening | In-Screening | A subject (ResearchSubject) undergoing a full evaluation to determine if they are eligible or ineligible for inclusion in a study (ResearchStudy).
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| eligible | Eligible | A subject (ResearchSubject) who has passed a full evaluation against the protocol specified eligibility criteria to determine if they are eligible or ineligible for inclusion in a study (ResearchStudy).
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| ineligible | Ineligible | A subject (ResearchSubject) who has failed an evaluation against the protocol specified eligibility criteria to determine if they are eligible or ineligible for inclusion in a study (ResearchStudy).
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| on-study | On-Study | A subject (ResearchSubject) who is enrolled in a study (ResearchStudy).
In a retrospective study context: the start of the period during which a subject's data is included, observed, or considered as part of the study analysis.
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| on-study-intervention | On-Study-Intervention | A subject (ResearchSubject) who is in an intervention phase of a study (ResearchStudy).
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| in-follow-up | In-Follow-Up | A subject (ResearchSubject) who has completed planned study (ResearchStudy) procedures and tests and is being monitored based on a protocol-prescribed schedule.
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| off-study | Off-Study | A subject (ResearchSubject) who is no longer participating in a study (ResearchStudy).
In a retrospective study context: the end of the period during which a subject's data is included, observed, or considered as part of the study analysis.
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| follow-up | Follow-up | A person is no longer receiving study intervention and/or being evaluated with tests and procedures according to the protocol, but they are being monitored on a protocol-prescribed schedule.
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| not-registered | Not Registered | A person for whom registration was not completed.
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| on-study-observation | On-study-observation | The subject is being evaluated via tests and assessments according to the study calendar, but is not receiving any intervention. Note that this state is study-dependent and might not exist in all studies. A synonym for this is 'short-term follow-up'.
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| pending-on-study | Pending on-study | A person is pre-registered for a study.
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| potential-candidate | Potential Candidate | A person that is potentially eligible for participation in the study.
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| screening | Screening | A person who is being evaluated for eligibility for a study.
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| withdrawn | Withdrawn | The person has withdrawn their participation in the study before registration.
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