Sigmoidoscopy: The colonoscopy’s cheaper, equally effective predecessor

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…