Yes, I had this test done last year. It went better than I expected. I read about it online, and it helped a lot. I read that the patient had to have a urethral & rectal catheter, and that kinda scared me (I strongly dislike catheters because they hurt so bad - for me anyway). But that wasn't as bad as I thought it would be. Yes, it has to do with computers and measuring the urine flow and the capacity that your bladder can hold your urine.