Urinary NGAL values at 4 hours in patients with no AKI, transient AKI, and intrinsic AKI are represented in Figure 3, and this separately for AKI defined on urinary output (Figure 3A), on creatinine (Figure 3B), or both criteria (Figure 3C) (P value overall < 0.001). This evidence concerns the gene LCN2 and acute kidney injury.