Tip - Why No Water Before a Colonoscopy? | eHow

Why No Water Before a Colonoscopy?. Long considered the gold standard of detecting the presence of cancerous polyps lining the colon and rectum, a colonoscopy happens when a physician inserts a lighted tube with a camera on the end (known as an endoscope) to view inside the colon. In order to best view the colon, a physician will recommend a...