Not all: Colonoscopy will rule out colon cancer , ulcerative colitis , ( early uc in remission may not show the disease ) but not crohn's involving only small bowel only , other ibd some times may not have visible pathology . All of these diseases need biopsy as a proof.
Answered 12/9/2013
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No: Crohn's disease can still be in the small bowel and not seen by colonoscopy. It can rule out colon cancer and ulcerative colitis.
Answered 1/4/2013
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