ABO incompatible platelets: risks versus benefitDunbar, Nancy M.a,b; Ornstein, Deborah L.a,b; Dumont, Larry J.aCurrent Opinion in Hematology: November 2012 - Volume 19 - Issue 6 - p 475–479 doi: 10.1097/MOH.0b013e328358b135 TRANSFUSION MEDICINE AND IMMUNOHEMATOLOGY: Edited by Martin L. Olsson Abstract Author Information Purpose of review: The importance of ABO blood group system compatibility in platelet transfusion is a subject of ongoing debate. Although there are theoretical advantages to pursuing a strict policy of providing exclusively ABO-compatible products, resource challenges may make this untenable for many transfusion services. Moreover, data supporting a net clinical benefit for this practice have been lacking. This review summarizes recent developments in the area of ABO compatibility and platelet transfusion and examines the risks and benefits associated with transfusion practices allowing for platelet ABO incompatibility. Recent findings: ABO-major incompatible transfusions are associated with lower platelet count increments than either ABO identical or minor incompatible transfusions and may lead to decreased intervals between platelet transfusions in thrombocytopenic patients. ABO-minor incompatible transfusions may rarely result in acute hemolytic reactions that are not predicted by isohemagglutinin titers. Yet published evidence to date does not clearly demonstrate improvements in clinical outcomes for patients receiving ABO-identical or ABO-compatible platelets. Adherence to a strict policy of transfusing exclusively ABO-identical platelets may lead to an increase in product wastage and challenges in maintaining adequate platelet availability. Summary: There is presently limited data and no consensus on the best approach for managing ABO compatibility in platelet transfusions. Well designed, sufficiently powered randomized clinical trials are urgently needed. These studies must examine not only safety and efficacy of various ABO matching strategies but also clinical benefit and resource utilization in order to identify optimal platelet transfusion strategies. aDepartment of Pathology, Center for Transfusion Medicine Research, the Geisel School of Medicine at Dartmouth bDepartment of Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA Correspondence to Larry J. Dumont, MBA, PhD, One Medical Center Drive, Lebanon, NH 03756-0001, USA. Tel: +1 603 650 5000; fax: +1 603 650 4845; e-mail: Larry.J.Dumont@hitchcock.org © 2012 Lippincott Williams & Wilkins, Inc.