It appears to me you never had the extreme honor of having to be forced to have a colonoscopy by your well meaning family doctor or you would have no need to ask that question. The "area" that is covered by this procedure and the way that it is performed has a considerable risk factor to it.  For me and I am sure thousands of countless others when an easier way to find the same information one can get from a colonoscopy is found sign us up.  LOL