test tomorrow

hey guys,
i have to back to into the doctor tomorrow for another test. i forget what it is called but i fast, they feed me eggs, toast and jam and then they "watch what comes out." has anyone ever had this test? i'm just nervous, every time i go in for a test, they find out something else is wrong. does anyone know what this test looks for??

It could be for transit time or fecal fat content. Either of those sound familiar?

q