LCN2 and acute kidney injury: The AUC of lactate-adjusted NGAL for AKI (AUC 0.90, 95% CI 0.87–0.93) is significantly greater than the AUCs of lactate (p < 0.001 vs. AUC 0.55, 95% CI 0.50–0.61) or NGAL (p < 0.001 vs. AUC 0.74, 95% CI 0.70–0.79).