LCN2 and acute kidney injury: The mean urinary NGAL levels were 56.1 ± 28.5, 49.4 ± 14.4, and 329.3 ± 63.6 ng/mL in the non-AKI, prerenal, and intrinsic AKI groups, respectively (P < 0.001); moreover, the mean urinary calprotectin levels were 195.8 ± 89.0, 385.2 ± 271.7, and 2404.5 ± 417.9 ng/mL, respectively (P < 0.001) (Figure 1).