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Subject Visits describes the actual start and end date/time for each visit of each individual subject. Planned trial visits are described in the Trial Design Model (see Section 5.1.4.1, Trial Visits). Because actual data does not always follow the plan, the SDTM allows for descriptions of unplanned visits for subjects (SVUPDES).
See the implementation guides for further guidance regarding use of additional identifier and timing variables.
Subject Visits—One Record per Subject Visit, per Subject
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