Many promising AKI biomarkers have been reported, such as neutrophil gelatinase-associated lipocalin (NGAL), kidney injury molecule one (KIM-1), liver type fatty acid-binding protein (L-FABP), and interleukin-18 (IL-18), and calculation of [IGFBP7] × [TIMP-2]. Here, LCN2 is linked to acute kidney injury.