Human: My doctor says I need a colonoscopy. What does that involve? Assistant: 
A colonoscopy involves an examination of the large intestine with a camera. The procedure is performed by a doctor or medical professional and can be done in a hospital, outpatient center, or even at home. During the procedure, the doctor inserts a long tube with a camera on the end into the rectum. The camera sends images to a monitor so that the doctor can view the inside of the large intestine. The doctor may also take samples for further analysis.