How It Is Done
A colonoscopy may be done in a doctor's office, clinic, or a hospital.
During the test, you may get a pain medicine and a sedative put in a vein in your arm (IV). These medicines help you relax and feel sleepy during the test. You may not remember much about the test.
Before the test
You will need to take off most of your clothes. You will be given a gown to wear during the test.
You may lie on your left side with your knees pulled up to your belly. Because you will be given medicine during the colonoscopy, you probably won't remember having the test when you wake up.
Next, the doctor will insert a thin, flexible colonoscope in your anus and move it slowly through the rectum and into your colon. Air will be used to inflate your colon so the doctor can see the lining of the colon on a monitor.
During the test
Your doctor will look at the whole length of your colon as the scope is gently moved in and then out of your colon. You may be asked to change your position during the test.
The doctor may also collect tissue samples (biopsy) or take out growths. Usually, people don't feel anything if a biopsy is done or if polyps are taken out.
The scope is slowly pulled out of your anus, and the air escapes. Your anal area will be cleaned with tissues. If you are having cramps, passing gas may help relieve them.
After the test
After the test, you'll stay at the clinic until you wake up and then have a brief visit from your doctor. Then you'll be allowed to leave with the person who will drive you home.
How long the test takes
The test usually takes 30 to 45 minutes. But it may take longer, depending upon what is found and what is done during the test.