Gastroenterologist | St. Louis, MO | Gateway Gastroenterology, St. John's Mercy Medical Center Gastroenterology - St Louis, MO/ Gateway Gastroenterology, Inc:: Gastroenterologist services at St. John's Mercy Medical Center
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st. louis gastroenterology

Our goal is to provide outstanding care in a timely, courteous, and professional manner. Our mission is to aid in improving your digestive health and also to be a resource to your primary care physician in caring for you. All of our physicians are committed to ongoing education and will make every effort to provide you with the most up to date and thorough care possible.

Colonoscopy | Acid Reflux

Gateway GI is located at 621 S. New Ballad Rd, Suite 228 A, St. Louis, MO 63141. Phone: 314-251-6973.

We offer a wide variety of gastroenterology services including inpatient and outpatient consultation as well as a broad range of endoscopic procedures including upper endoscopy and colonoscopy. We test for acid reflux, IBS, chron's disease, colon cancer, pancreas and intestinal problems and diseases, gall stones, kidney stones and more.

Gateway Gastroenterology is a group of gastroenterologists st. louis - Missouri 63141

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After receiving his B.S. in engineering from Northwestern University in 1980, Dr. Loren Marshall moved on to Vanderbilt University to obtain his M.D. four years later. He remained there to complete a three-year internal medicine residency before going to the University of Texas – Southwestern to work on his gastroenterology fellowship. In 1991, he completed his ERCP fellowship at Washington University. Dr. Marshall has been practicing for 14 years and is board certified in internal medicine and gastroenterology. He is a proud member of the American Gastroenterological Association, American College of Gastroenterology, American Society of Gastrointestinal Endoscopy and the American College of Physicians.