How is massive 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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Massive LGIB is defined as follows:

Note the following:

  • Passage of a large volume of red or maroon blood through the rectum

  • Hemodynamic instability and shock

  • Initial decrease in hematocrit (Hct) level of 6 g/dL or less

  • Transfusion of at least 4 U of packed red blood cells (PRBCs)

  • Bleeding that continues for 3 days

  • Significant rebleeding in 1 week

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