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What does a colonoscopy involve?
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A colonoscopy involves an examination of the large intestine using a flexible tube called an endoscope. The doctor inserts the endoscope into the rectum and slowly advances it through the entire length of the colon, allowing the doctor to view the inside walls of the colon. This allows the doctor to examine the lining of the colon for any signs of disease or polyps that may be present. The doctor may also take biopsies from any suspicious areas.