A thin, flexible tube (endoscope) is usually inserted through the mouth and into the upper gastrointestinal tract. During a double-balloon enteroscopy, balloons attached to the endoscope can be inflated to allow the doctor to view a large part of the small intestine.
In a colonoscopy, a flexible tube is inserted through your rectum and colon. The tube usually can reach into the end part of the small intestine (ileum). See also: Colonoscopy
Tissue samples removed during enteroscopy are sent to the laboratory for examination.
How to prepare for the test
Do not take products containing aspirin for 1 week before the procedure. Tell your doctor if you take blood thinners such as warfarin (Coumadin) or clopidogrel (Plavix), because these may interfere with the test. Do NOT stop taking any medication unless told to do so by your health care provider.
Do not eat any solid foods or milk products after midnight the day of your procedure. You may have clear liquids until 4 hours before your exam.
You must sign a consent form.
How the test will feel
When the tube is put into your mouth and down your esophagus (food pipe), you may feel like gagging. You will get a numbing medicine to reduce this feeling.
You may get a mild sedative, but only in small doses because you must stay alert enough to help with the procedure (by doing such things as swallowing and turning). The biopsy sampling causes little or no pain, although you may have some mild cramping.
Why the test is performed
This test is most often performed to help diagnose diseases of the small intestines. It may be done if you have:
Abnormal x-ray results
Tumors in the small intestines
Unexplained gastrointestinal bleeding
In a normal test result, the health care provider will not find sources of bleeding in the small bowel, and will not find any tumors or other abnormal tissue.
What abnormal results mean
Signs may include:
Abnormalities of the tissue lining the small intestine (mucosa) or the tiny, finger-like projections on the surface of the small intestine (villi)
Abnormal lengthening of blood vessels (angiectasis) in the intestinal lining
Sidhu R, Sanders DS, Morris AJ, McAlindon ME. Guidelines on small bowel enteroscopy and capsule endoscopy in adults. Gut. 2008;57:125-136.
David C. Dugdale III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.