Sigmoidoscopy exam: The sigmoid colon is the last bend of the gut before food reaches the rectum. Accordingly, examination of the sigmoid & left colon (hence the name "sigmoidoscopy") involves a flexible tube inserted into the rectum (often under sedation if you wish). The procedure takes only a few minutes & typically requires only a limited preparation. On the other hand, "colonscopy" examines the whole colon.
Answered 6/29/2020
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