Colonoscopy

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Physicians claims that colonoscopies are the gold standard of preventive medicine.  In 2008 the American Cancer Society deemed the colonoscopy as the preferred test and the health reform law (PPACA) will compel insurance companies to cover colonoscopies.  But does the sigmoidoscopy–the colonoscopy’s predecessor–offer less expensive, less invasive, equally effective preventive care?

[The sigmoidoscopy] looks at only half the colon. In that test, there’s no sedation, no day off from work, no jug of laxatives the night before and maybe no gastroenterologist. Your primary care doctor could probably do the procedure himself…

Colonoscopy is three to four times more expensive than the simpler sigmoidoscopy test. And the risk of complication is seven times higher. Still the idea caught on. And as it did, it transformed the profession of gastroenterology. We went from too many specialists to a national shortage.

In fact, the inventor of the colonoscopy, Al Neugut, wrote an editorial in the JAMA this summer stating that he regrets inventing the colonoscopy.  On Marketplace, Neugut said “If today, we were where we were in 1988, I would not institute colonoscopy based on the current evidence.”

The gold standard of preventive medicine may only be golden from the point of view of physician salaries.

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Clinical trials often examine the effectiveness of a treatment outside of real world contexts.  For instance, if a medicine is very effective, but has severe side effects, this likely will reduce adherence and can make the medicine less effective in the real world.  The Economics 2.0 book looks at when individuals are most satisfied with a colonoscopy:

[An] experimental was conducted with colonoscopies at a time when sedation was not yet customary.  With half of the patients, the doctor left the instrument inside the colon at the end of the examination for one extra minute, without moving it.  This was unpleasant, but much less painful than the colonoscopy itself.  It turned out that patients who had this done to them later recalled the overall examination as less unpleasant than other test subjects who had the instrument removed earlier.  Also, they were more likely to show up for follow-up examinations.

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