You will need to take medication (6 – 8 glasses) to clean out your large intestine the evening before the test, so that clear views can be obtained. During the procedure, everything will be done to make you as comfortable as possible. Colonoscopy is done with you lying on your left side. An injection of a sedative and painkiller is usually given to make you relaxed and go into a light sleep. Your pulse and oxygen level will be monitored with a finger-probe throughout the procedure.
Lubricant will be applied into your anus. A fingertip examination of the anal canal is first carried out. The colonoscope is then gently introduced into the anus and steered through the entire large intestine. The entire procedure takes between 15 to 20 minutes. In cases where a polyp removal is necessary, it may take 10 – 15 minutes longer, depending on the number of polyps to be removed.