Ronee'-babygirl is right. It's not a bad test unless you don't like IVs, I didn't have any discomfort at all. It just too a long time because mine wouldn't fill up or empty properly. Not a big deal really. You will just spend a lot of time on an uncomfortable xray type table. Sometimes on your back and maybe on your side if the bladder doesn't drain right, like mine did. Once again, no big deal, please don;t get worked up. This is an easy one to study for and take.