I called the CRS office and the receptionist told me she was "sure" it'd be OK, that I could keep the appointment as long as I was wearing a tampon. I've been using the Keeper (
http://www.keeper.com ) for about 15 years now, but thought it might be too, um, complicated when there's so much stuff going on. So I made a trip to the tampon aisle for the first time in a billion years. Hello all you males who are grossed out by this! :)
"Worst" case: they give me the drugs and THEN evaluate that we have to postpone. Those 12 seconds before the IV meds kick in are sublime. It's what makes yearly colonoscopies worthwhile. Well, that and getting clean results, of course.