Colonoscopy Colonoscopy is a test that enables your specialist to take a look at the inward covering of your internal organ (rectum and colon). A colonoscopy discovers ulcers, colon polyps, tumors, and ranges of aggravation or dying. Amid a colonoscopy, tissue tests can be gathered (biopsy) and irregular developments can be taken out. Colonoscopy can be utilized as a screening test to check for a tumor or precancerous developments in the colon or rectum (polyps). The colonoscope is a thin, adaptable tube that reaches from 48 in. (125 cm) to 72 in. (183 cm) long. Colonoscope has a little camcorder. This helps to observe the entire colon and the lower portion of the small digestive tract. A test called sigmoidoscopy indicates just the rectum and the lower some portion of the colon. Colonoscopy is one of many tests that might be utilized to screen for colon growth. Different tests incorporate sigmoidoscopy, stool tests, and processed tomographic colonography. Colonoscopy is done to: Check for colorectal tumor or polyps. Your specialist may prescribe prior or more regular testing on the off chance that you have a higher danger of colorectal growth. Converse with your specialist about when you ought to be tried.