LCN2 and Renal insufficiency: AUC: area under the curve; CI: confidence interval; Crp: plasma creatinine; Cru: urinary creatinine; FABP1: fatty acid binding protein 1; FENa, fractional excretion of sodium; GM2AP, GM2-activator protein; KIM-1, kidney injury molecule 1; NAG, N-acetyl-β-d-glucosaminidase; NGAL, neutrophil gelatinase-associated lipocalin; REG3A, regenerating islet-derived 3 alpha; RFI, renal failure index; SD, Standard deviation; TCP1-eta, T-complex protein 1 eta.