When I had my last urodynamic study, after filling my bladder too much they got their X-Rays etc. then handed me the pitcher and said you can relieve yourself. Well with neurogenic bladder that’s a lot easier said then done! I still have TOO MUCH sensation and it was killing me, yet the harder I tried to push, the more it hurt. My nerves don’t get the signal to open, it only clamps the sphincters closed harder about 50% of the time. They came back in and immediately ordered a new foley to empty my bladder. 2 minutes later it was like a fire hose let loose when the sphincters relaxed without any warning and the tech had taken away the pitcher! This time they could see all the blood in the urine as it was all over me, the gown, the floor etc. from cracking open the fissures in my bladder that cause my OAB. It was a painful mess, but they certainly got answers!