Changes in hemoglobin, lactate dehydrogenase and total bilirubin levels after the transfusion. The white arrow indicates 1 unit of A＋ Fy(a＋b–) leukoreduced filtered red blood cell (LRFRBC) transfusion and the black arrow indicates 1 unit of O＋ Fy(a–b＋) LRFRBC transfusion.

Abbreviations: Tx, transfusion; HD, hospital day; LDH, lactate dehydrogenase.