RESUMO
A2B negative is one of rare subgroups of ABO blood group system. Herein, we report a 59-year-old male patient who was candidate for coronary artery bypass grafting surgery [CABG] due to coronary artery stenosis. The patient`s blood group was reported as AB negative in routine laboratory, and because of doubtful result, a complementary test confirmed his blood group as A2B negative. The consultant hematologist recommended reserving either negative A2B packed red blood cell [PRBC] or if unavailable O- blood group. After induction of anesthesia three units of patient's own blood were collected and replaced by colloid solution. The patient underwent CABG with hypothermic cardiopulmonary bypass. The collected autologous blood units were transfused at the end of operation. The patient received one unit of A2B- homologous PRBC in the postoperative period, and was discharged without any reaction to transfusion