LCN2 and acute kidney injury: The area under the ROC curve (AUC) for the prediction of acute kidney injury was comparable for both markers (creatinine 0.69; 95%CI 0.59 to 0.79 versus NGAL 0.67; 95%CI 0.57 to 0.77; creatinine/NGAL combined: 0.69; 95%CI 0.59 to 0.79) (Figure 4).