Q. What instrument is used to perform a colonoscopy?
A. A colonoscope is used to perform a colonoscopy. This instrument is used to view the inner lining of the large intestine, that is, the rectum and colon. It is a thin, flexible tube ranging from 48 in. (125 cm) to 72 in. (183 cm) long, and has a small video camera attached for taking pictures or videos of the large intestine (colon). The doctor can view the entire colon and the lower part of the small intestine with a colonoscope.