Not sure I understand your question. But if you are speaking of having a prep for a disconnected J pouch before a scope that would seem to be ridiculous.
The basic problem is the medical staff rarely understands the procedures we have had done and so if you are scheduled for a scope the computer automatically comes up with the typical scope prep. I get scoped every two years even though I have no pouch and an end ileo but they left the anus an a tiny amount of intestine and the nurses come unglued when I tell them I didn't follow the prep instructions. Rather then try to explain I tell them to speak the my GI and she calms them down.