In 68 patients without AKI at admission, plasma NGAL levels exhibited an AUC = 0.522 (95% CI: 0.383–0.661, p = 0.759) for all AKI stages, with an 81.3% sensitivity and 69.5% specificity for a 45.4 ng/mL cutoff. The gene discussed is LCN2; the disease is acute kidney injury.