RT Book, Section A1 Chajewski, Olga S. A1 Squires, Jerry E. A2 McKean, Sylvia C. A2 Ross, John J. A2 Dressler, Daniel D. A2 Scheurer, Danielle B. SR Print(0) ID 1137608441 T1 Postoperative Blood Transfusion T2 Principles and Practice of Hospital Medicine, 2e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9780071843133 LK accessmedicine.mhmedical.com/content.aspx?aid=1137608441 RD 2024/04/18 AB Over 13.8 million units of red blood cells are transfused to over 5 million patients in the United States in 2011; blood transfusion is one of the most common procedure codes recorded at discharge for hospitalized patients. It is estimated that 60% to 70% of these transfusions occur in relation to surgical procedures. For over 40 years it was generally assumed that patients benefitted from transfusions whenever the hemoglobin fell below 10 g/dL or if the hematocrit fell below 30% (the so-called “10/30 rule”). Controversy remains regarding the appropriate selection of patients requiring transfusion, as well as the recognition and management of adverse transfusion reactions.