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Subject Visits (SV) is a pecial special-purpose domain that contains information for each subject's actual and planned visits.

The Subject Visits SV domain consolidates information about the timing of subject visits that is otherwise spread over domains that include the visit variables (VISITNUM and possibly VISIT and/or VISITDY). Unless the beginning and end of each visit is collected, populating the SV dataset will involve derivations. In a simple case , where , for each subject visit , exactly 1 date appears in every such domain, the SV dataset can be created easily by populating both SVSTDTC and SVENDTC with the single date for a visit. When there are multiple dates and/or date/times for a visit for a particular subject, the derivation of values for SVSTDTC and SVENDTC may be more complex. The method for deriving these values should be consistent with the visit definitions in the Trial Visits (TV) dataset (See see Section 3.3.1.1.1,  Schedule for Assessments (TV)).  

 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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