During the colonoscopy procedure, a specially trained doctor uses a colonoscope to examine the lining of your bowel. A colonoscope is a long, thin flexible tube with a tiny camera and a light on the end.
Before the procedure, your doctor will discuss what is going to happen with you and you will have a chance to ask questions. You will need to change into a hospital gown.
When you are ready, you will be given a sedative and asked to lie on your side or back while the doctor gently inserts the colonoscope into your back passage and slowly moves it along the inside of your bowel.
The video camera on the colonoscope streams video images to a TV screen, allowing the doctor to see the lining of your bowel. Your doctor will examine the lining again as they slowly withdraw the colonoscope.
In some cases, the doctor cannot pass the colonoscope through the entire colon. Your doctor will let you know whether you need any other tests.