LCN2 and acute kidney injury: In the non-AKI group, urinary KIM-1 levels (r = 0.007, p > 0.05), urinary NGAL levels (r = −0.018, p > 0.05), and serum Cys C levels (r = −0.135, p > 0.05) were not correlated with GFR (Fig. 4).In the healthy control group, urinary KIM-1 levels (r = 0.019, p > 0.05), urinary NGAL levels (r = 0.056, p > 0.05), and serum Cys C levels (r = −0.002, p > 0.05) were not correlated with GFR (Fig. 5).