How is acute lower gastrointestinal (GI) bleeding (LGIB) defined?

Updated: Jul 26, 2019
  • Author: Burt Cagir, MD, FACS; Chief Editor: BS Anand, MD  more...
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LGIB encompasses a wide spectrum of symptoms/signs, ranging from relatively trivial hematochezia to massive hemorrhage with shock. [6] Acute LGIB has been defined as bleeding that is of recent duration, originates beyond the ligament of Treitz, results in instability of vital signs, and is associated with signs of anemia with or without the need for blood transfusion. The definition of LGIB from the American College of College of Gastroenterology clinical guideline is "the onset of hematochezia originating from either the colon or the rectum." [5]

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