What is Colonoscopy

Colonoscopy is a test which allows the Surgeon to look directly at the lining of the large bowel (the colon). In order to do the test a colonoscope is carefully passed through the anus into the large bowel. The colonoscope is a long flexible tube, about the thickness of your index finger, with a bright light at the end. Looking down the tube the Surgeon gets a clear view of the lining. For examination in the laboratory a small piece of tissue is removed painlessly through the colonoscope, using tiny forceps.
It is also possible to remove the polyps during the colonoscopy. Polyps are abnormal projections of tissue, rather like warts, which the Surgeon will want to examine in more detail.

The Operation

In the Endoscopy suite you will be made comfortable on the bed, resting on your left side with your knees slightly bent. A nurse will stay with you throughout the test. The doctor may give you a sedative injection to make you sleepy and relaxed. The nurse will probably attach a small device to your finger or thumb, in order to record your pulse rate and monitor your general condition during the examination. When the tube has gently been inserted through the anus into the large bowel, air will be passed through it to distend the colon to give a clearer view of lining. This may give you some wind like pains but they will not last long. You may get the sensation of wanting to go to the toilet, but as the bowel is empty there is no danger of this happening. You may pass some wind but, although this is embarrassing, remember they do understand what is causing it. It usually takes up to thirty minutes for the colon to be examined, but the test sometimes lasts longer. X-ray equipment may also be used. When the examination is finished, the tube is removed quickly and easy.