A duodenal tissue biopsy is performed by inserting a special tube through the nose or mouth down into the duodenum. When the tube is in place, it suctions out some of the fluid located in the duodenum. When the procedure is over the tube is removed. The sample is sent to the laboratory for testing. The test is performed to see if a bacterial infection is present or if there are any other microorganisms present that could be causing infection.
Review Date 4/10/2020
Updated by: Michael M. Phillips, MD, Clinical Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.