Screening colonoscopy is an endoscopic examination focused on finding tumours in the large intestine before the patient notices any difficulties or symptoms..
It provides much more reliable test results than FOBT. It involves examination with a special device, a colonoscope, which is inserted into the large intestine via the anus. A colonoscope looks like a thin, flexible hose, and can transmit images from the intestines to the doctor's monitor. Thanks to a sensitive optical system, the doctor can see a real image of the large intestine, plus it can also be used to take tissue samples for further testing, and can also remove unwanted polyps that give rise to cancer.
This examination is performed for patients who have had a positive occult bleeding test or for patients over the age of 55 even without prior stool testing.