Scatterplot demonstrating the negative correlation (best fit regression lines are shown) between the peak serum iron at 2 hours after transfusion and the decrease in Hb (A) and HbA percent decrement after transfusion (B). Although the negative correlation was seen at all time points observed, the negative correlation was significant for Hb at 2 weeks after transfusion (n = 32; r = –0.42; P = .01) and HbA percent increment at 2 hours (n = 32; r = –0.4; P = .03) and 24 hours (n = 28; r = –0.5; P = .01) after transfusion.