A ResearchSubject is a participant or object which is the recipient of investigative activities in a research study. A ResearchSubject is a participant or object which is the recipient of investigative activities in a research study. If the element is present, it must have either a @value, an @id, or extensions Identifiers assigned to this research subject for a study. The publication state of the resource (not of the subject). The current state (status) of the subject and resons for status change where appropriate. The dates the subject began and ended their participation in the study. Reference to the study the subject is participating in. The record of the person, animal or other entity involved in the study. The name of the arm in the study the subject is expected to follow as part of this study. The name of the arm in the study the subject actually followed as part of this study. A record of the patient's informed agreement to participate in the study. A ResearchSubject is a participant or object which is the recipient of investigative activities in a research study. Identifies the aspect of the subject's journey that the state refers to. The current state of the subject. The milestones the subject has passed through. The reason for the state change. If coded it should follow the formal subject state model. The date when the new status started. The date when the state ended.