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You should have a colonoscopy every 10 years starting at age 50. Alternatively, you may get a flexible sigmoidoscopy every five years, a double-contrast barium enema every five years or a CT colonography (virtual colonoscopy) every five years. However, a colonoscopy will be needed if any of those results are positive.
The next best data come from studies showing the benefits of sigmoidoscopy (fiber-optic visual assessment of the left side of the colon) every five years combined with stool blood testing. Many experts believe that colonoscopy (fiber-optic examination of the entire colon) every 10 years is beneficial.