http://www.niddk.nih.gov/health/digest/pubs/diagtest/index.htm
National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health
This document contains patient education fact sheets on six diagnostic tests for gastrointestinal disorders: colonoscopy, sigmoidoscopy, upper endoscopy ERCP, lower GI series, and upper GI series. These materials are designed to be reproduced.