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 For some studies, a "visit" may be defined to correspond with a clinic visit single encounter that occurs within 1 day, whereas for other studies a visit may reflect data collection over a multiday period.

The SV dataset provides reviewers with a summary of a subject’s visits over the course of their participation in a study. Comparison of an individual subject’s SV dataset with the TV dataset, which describes the planned visits for the trialstudy, supports the identification of planned but not expected visits due to a subject not completing the study.  Comparison of the values of SVSTDY and SVENDY to VISIT and/or VISITDY can often highlight departures from the planned timing of visits. 

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