my daughter just had her check up to see if her pouch is okay. They didn't do it the way suebear had said. They put a cathater through her stoma it was clear liquid don't remeber what they called it. She had no discomfort at all. As we got to watch as the pouch filled up. No leaks from what the doctor could see. We did bring extra things to change incase needed. She has the two piece so we just changed the bag when they were done.