LCN2 and acute kidney injury: NGAL/creatinine ratios were 2.6 fold higher in those subjects, who later developed CI-AKI (47.8 [IQR 11.8–75.3] vs. 18.6 [IQR 11.7–36.3] μg/mg), but failed to reach significance (AUC 0.63 [95% CI 0.46–0.79]; p = 0.102).