F2 and liver failure: Applying ROC curves and the area under the curve (AUC) for the evaluation of the different tests as predictors of hepatic failure, favorable data were obtained in relation to bilirubin (AUC = 0.922) and prothrombin time (AUC = 1), and for postoperative PDR (AUC = 0.879) and GOT (AUC = 0.857), but not for preoperative PDR (AUC = 0.667) or GPT (AUC = 0.6) (Figure 1).