Prep definitely differs from doc to doc. I have actually had scopes done where no prep was required. I just had a scope done last month and again, no oprep was required. I actually requested a prep because I worried that results wouldn't be reliable if I wasn't "cleaned out" completely and I'd have to have scope done again. Not that scopes are a big deal but it's a day off from work & I have to arranged a ride. After I requested a prep, doc said to just do 1 enema before bed & 1 in the morning, before I left home to have scope done.