LCN2 and acute kidney injury: The ROC curve analysis revealed that serum NGAL concentration, at a cut-off value of 140.7 mg/dL after 24 h, could predict the development of AKI with high sensitivity (88.9 %) and specificity (95.0 %), while umbilical NGAL concentration characterized with low sensitivity (55.6 %), but high specificity (89.5 %) for the prediction of AKI.