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The U.S. Multisociety Task Force and a joint task force of the American College of Gastroenterology and the American Society for Gastrointestinal Endoscopy counsel that adenoma detection rates during colonoscopy should be at least 25% in men and 15% in women and that withdrawal time should average at least 6 minutes in colonoscopies that do not include biopsies or polypectomies. Cross-sectional studies have shown that adenoma detection is associated with colonoscopy withdrawal time (JW Gastroenterol Nov 14 2008), but do longer withdrawal times actually improve detection rates, or are they simply markers for more-thorough mucosal examinations?
To find out, investigators examined the effect of an enforced 7-minute withdrawal time at a single U…