Medical Definition of Roux-en-Y gastric bypass

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Roux-en-Y gastric bypass: A surgical procedure which may be done for severe obesity. The procedure involves cutting the stomach in two to create a pouch out of the smaller proximal (near) portion of the stomach, attaching it to the small intestine, bypassing a large part of the stomach and all of the duodenum. The procedure may help with weight loss because the stomach pouch is too small to hold much food and skipping the duodenum reduces the absorption of fat which is rich in calories. The procedure may be done by laparoscopy. Also called a Roux-en-Y anastomosis or Roux-en-Y gastrojejunostomy.

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Reviewed on 12/11/2018

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