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.