Once a polyp becomes cancerous, the likelihood of cure is still much higher if it is detected at an early stage. The tube is passed through the entire length of the rectum and colon. If any polyps or cancers are detected, they can be biopsied or removed using special tools that are inserted through the tube of the colonoscope. The procedure takes about 30 to 45 minutes, and requires a special bowel preparation. Sedative medications often are given to make the procedure more tolerable.
Colonoscopy appears to be the most accurate method of screening for colorectal cancer.
Error while loading attribute ihlink contenti. Recent studies suggest that 30 percent of colon cancers may be missed by this procedure. Error while loading attribute ihlink contenti. The usual method for FOBT involves collecting several small stool samples at home, and placing these on special cards. A doctor or technician then uses chemicals to look for telltale evidence of blood.