I had my colonoscopy done about a month ago, by Dr.Gabriel.
Although I found it disconcerting there wasn't an appointment time given, until the day before. I was getting nervous as I couldn't start my prep, until I knew the appointment time. I was called in plenty of time to start the prep, and everything came out in the end.
This facility and it's staff are very professional and found the experience pleasant. A nice clean surgical center, run very efficiently, by staff personnel.
They have it down to a science, in terms of timing.
Dr. Gabriel is top notch. IMHO
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).