The ROC curves for AKI vs non-AKI were also generated for urinary NGAL at 2, 6, and 12 h, and the AUCs for the three ROCs were 0.632 (P<0.05), 0.657 (P<0.05), and 0.619 (P<0.05), respectively. This evidence concerns the gene LCN2 and acute kidney injury.