This test would be done every 4 years unless a person is at high risk, then would be done every 2 years. It is painless and can be done in the office without any sedation. This exam looks at the rectum and lower 2 feet of the bowel. This is an x-ray procedure and is done in an outpatient hospital or outpatient imaging center. A barium enema, followed by air is introduced into the rectum.
Barium provides contrast for the x-rays.
The x-rays can detect any abnormal outlines in the bowel. Colonosopy Colonoscopy is similar to the sigmoidoscopy but it gives a more complete picture of the entire colon. A biopsy can be done at the same time. It is somewhat uncomfortable and sedation is generally given. More Resources EZ Detect Information about this home fecal occult blood screening test.