Colonoscopy is most powerful when the bowel preparation is excellent! Did you know that colonoscopy is less effective (and less protective) when the bowel preparation isn’t done correctly? Colonoscopy is MOST EFFECTIVE when small polyps (6mm or less) can be seen clearly and removed. Small, flat polyps are difficult to see especially when there is residual stool in the colon at the time of screening colonoscopy. And, insurance companies may refuse payment for colonoscopy if it has to be repeated for an inadequate bowel preparation. Be sure to follow all of the recommendations for the bowel preparation and call the office with any questions.