Fig. 2. Receiver operating characteristic curves demonstrate the ability of intraoperative collagen-induced thrombus formation to detect post-CPB coagulopathy. Receiver operating characteristic curves were generated to relate the postprotamine collagen-induced thrombus formation to the intraoperative transfusion of platelets (bold solid line, area under the curve [AUC]= 0.81, P < 0.005), fresh frozen plasma (thin solid line, AUC = 0.79, P < 0.005), and platelets or plasma (dashed line, AUC = 0.78, P < 0.005). The diagonal line in gray indicates the line of identity (AUC = 0.50).