Several new biomarkers in serum and urine have been reported to show the potential for predicting AKI, including cystatin C (Cys C), neutrophil gelatinase-associated lipocalin (NGAL), interleukin-18 (IL-18), kidney injury molecular-1 (KIM-1), and so on [10,11]. Here, LCN2 is linked to acute kidney injury.