I had my cath removed last week and they conducted a bladder function test by injecting some saline into the bladder through the cath port and then see if you can give it all back into a cup. I passed! I hope you do too. There may be other criteria for approving cath removal, but that's all I had. Really wasn't as bad as I feared...over pretty quickly.

After the removal of my catheter, about 2AM I had the urge to pee. I couldn't and my bladder was full and my brother took me to emergency. It took a doctor almost a hour to see me and I was experiencing excruciating pain from my bladder. Finally a doctor arrived, catherized me and drained my bladder. I was put back on a catheter and bag for at least a month. After that time, it was removed and I was able to urinate on my own. Of course, I was instructed to self catherize during that time to make sure my bladder was empty. Not pleasant but all of that worked and I enjoyed normal urination afterwards.
Good luck!

My urethra collapsed
after prostate surgery (robatic) Wore a suprapubic
cathedar and had to have my urethra recomstructed.

Thats what can happen.