Colonoscopy is a procedure that allows us to examine the lining of the large intestine (colon) and look for any abnormalities. The procedure involves the insertion of a colonoscope, which is a long, thin, and flexible tube with a camera and light attached at the end, into the anus and advancing it all the way to where the colon and the small intestine meet. The colonoscope is then carefully withdrawn so that we are able to see all of the colonic lining. If there are any growths such as polyps, they can be removed during the procedure. If there is any lesions seen, biopsies (tissue samples) can be taken during the procedure as well. You will be under sedation for this procedure. Please refer to the American Society for Gastrointestinal Endoscopy website for a more detailed explanation. ASGE | Understanding Colonoscopy