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Hospital: 701-965-6384
Crosby Clinic: 701-965-6349
Care Center: 701-965-6086

Outpatient Surgery


A colonoscopy is an exam that views the inside of the colon (large intestine) and rectum, using a tool called a colonoscope.

The colonoscope has a small camera attached to a flexible tube that can reach the length of the colon.

  • You are likely given medicine into a vein to help you relax. You should not feel any pain. You are awake during the test and may even be able to speak. But you probably will not remember anything.
  • You lie on your left side with your knees drawn up toward your chest.
  • The colonoscope is gently inserted through the anus. It is carefully moved into the beginning of the large intestine. The scope is slowly advanced as far as the lowest part of the small intestine.
  • Air is inserted through the scope to provide a better view. Suction may be used to remove fluid or stool.
  • The doctor gets a better view as the scope is moved back out. Therefore, a more careful exam is done while the scope is being pulled back.
  • Tissue samples (biopsy) or polyps may be removed using tiny tools inserted through the scope. Photos may be taken using the camera at the end of the scope. If needed, procedures, such as laser therapy, are also done.


Upper endoscopy is a procedure that enables the examiner (usually a gastroenterologist) to examine the esophagus (swallowing tube), stomach, and duodenum (first portion of small bowel) using a thin, flexible tube called the upper endoscope through which the lining of the esophagus, stomach, and duodenum can be viewed using a TV monitor.

Mark Peterson, MD

Dr Peterson is a native of Grand Forks and a graduate of UND School of Medicine. He completed his Family Medicine Residency at the University of Wisconsin, Eau Claire. He is Board-Certified in Family Medicine. For twelve years, he worked as a physician for the indigenous Eskimo populations surrounding Bethel and Nome, Alaska. He helped develop a GI endoscopy clinic there and practiced upper endoscope and colonoscopy in AK for over ten years. He returned to Grand Forks in 2005 to start Aurora Clinic. He is committed to providing comprehensive, independent, full-service care to patient of all ages, from newborns to geriatrics. He sees patients in Grand Forks and admits patients to Altru Hospital. Dr. Peterson is married and has five children.