A colonoscopy is an outpatient procedure used to examine the colon, also called the large intestine or bowel. The colon and rectum form the last part of the body's gastrointestinal (GI) tract. A doctor who specializes in digestive diseases uses a long, narrow, flexible tube to examine the colon for irritated and swollen tissue, ulcers, and polyps (potentially cancerous tissue on the lining of the intestine). The tube (colonoscope) includes a light and a camera, as well as tools that can be used to remove polyps. A colonoscopy can help diagnose reasons for changes in bowel habits, abdominal pain, bleeding from the rectum, and weight loss. It also is a screening test for colon cancer in the hopes of finding the disease at an early stage. The day before the procedure, the patient follows bowel preparation instructions at home so that little to no stool is present in the intestine for the colonoscopy.  This allows for a more complete examination of the intestine. A gastroenterologist performs the colonoscopy at a hospital or outpatient center. Light anesthesia and pain medication relax the patient for the test. Another type of colonoscopy, called virtual colonoscopy, uses CT scans and computer technology to create images of the lining of the colon.


UAB Medicine is known worldwide as a leading center for digestive and liver disorders. Our gastroenterology and gastrointestinal (GI) surgery program is consistently recognized for excellence by U.S. News & World Report. We see more than 20,000 patients and perform more than 12,000 outpatient procedures each year.

UAB has a notable history in this medical specialty. Basil Hirschowitz, MD – who founded our program more than 50 years ago – was the inventor of the endoscope, a tubular, flexible instrument equipped with a tiny camera that is used to look deep inside the body. His invention revolutionized gastroenterology and GI surgery care. Our interventional endoscopy group, which includes endoscopic ultrasound technology, is one of the busiest in the country and has grown to become one of the most respected programs of its kind.

UAB continues to lead the advancement of gastroenterology with many active research trials that offer the latest in drug therapy and treatment for digestive disorders. Our physicians and scientists are searching for causes and cures for many illnesses through basic research, including studies of the bacteria that inhabit our intestines and affect our health.

UAB Medicine operates the Digestive Health Center, which combines gastroenterology care, GI surgery, and a broad range of advanced diagnostic and supportive services in a single, convenient location for our patients. The center features specialists in gastroenterology and hepatology, colorectal surgery, transplant surgery, and nutrition, all of whom work together to form a diverse team of digestive health experts. The Digestive Health Center provides a fully integrated model of care that optimizes the patient experience and offers the absolute latest in testing, technology, and treatment.





UAB is an active participant in research and clinical trials. We encourage you to speak to your physician about research and clinical trial options and browse the link below for more information.

View Clinical Trials