Propofol administered by a nurse anesthesiologist for a colonoscopy. should that be of concern?

Please clarify: That is the standard normal colonoscopy process in many if not most GI practices.

Depends: In the us, the term "anesthesiologist" means a fully-trained physician. A crna is a nurse anesthetist, not a doctor. Make sure a physician anesthesiologist is available for backup and supervision of a nurse anesthetist. Propofol is a good med for sedation for colonoscopy, but needs careful monitoring of breathing and blood pressure. The procedure won't take long, and you'll wake up quickly.