AMERICAN COLLEGE OF GASTROENTEROLOGY Questions and Answers about Quality in Colonoscopy Why is quality important in colonoscopy? Although colonoscopy has been available in clinical practice for more than 40 years, only in the past 15 years has awareness developed that the success of colonoscopy in preventing colorectal cancer and minimizing complications is very dependent on the skill and competence of the colonoscopist. Colonoscopists differ substantially in the number of pr