Human: My doctor wants me to get a colonoscopy, but I've never done one before. What should I expect? Assistant: 
A colonoscopy is a procedure that uses a thin tube with a camera at the end to examine your colon. The tube will be inserted into your rectum and advanced through your colon until it reaches your cecum (the last part of your colon). During the exam, your doctor will look for polyps or other abnormal growths in your colon. You may also be asked to drink a laxative beforehand to help move your bowels and make the procedure easier. After the exam, you'll need to stay overnight in the hospital so doctors can monitor any potential complications.