Derive visits from: Use this option to specify the domains from which to derive visit dates. Available options are described in the following table: Choose When you want to: SV domain Use information from the SV domain alone. All dates between and including the start (SVSTDTC) and stop (SVENDTC) dates for the visit are considered. findings domains Use information from all available findings domains. To Specify the Source for Deriving Visit Dates: Click the appropriate radio button.