In recent 5 years, years, 118 835 units of blood components were transfused at the Chonnam Univerty Hospital. We experienced 49 cases of problem; the sampling errors in 20, ABO discrepancies in 15, hemolytic transfusion reactions due to
misidentification of patient in 3, clerical errors of laboratory technician in 2, mislabelling at Red Cross Blood Center in 8 and polyagglutination in 1.
ABO discrepancies were caused by the decreased antibody titer (7 cases), A or B subgroup (4 cases), weakening of blood group antigen (2 cases of acute leukemia), cold agglutinin(1 case) and rouleaux formation (1 case).
These results suggest that the critical to the safe transfusion should be not only the accurate blood typing and cross-matching, but collecting a properly identified and labeled blood sample from the patient.
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