So on Friday I am going to have this test. From what I have read, they fill you up with stuff then ask you to go to the bathroom and monitor your pelvic muscles via Xray. The only prep they asked for is 2 Fleet enemas early that morning. If they are trying to get me emptied, I doubt that will do it....Has anyone out there had one? Do you think I should take my Dulcolax the night before or do anything else?It is very frustrating, the test sounds awful, the coordinator couldn't care less, I am just a name on a list. I asked if they could use water soluble stuff (which my gastro requested when we did the barium enema) and both she AND the colorectal surgeon were like, You will have to talk to the radiologist. Also I did the sitz marker test about a month ago, and the colorectal surgeon who ordered it never has called me back with the results. I assume he is waiting to have this other test's results but he could have called.