LCN2 and acute kidney injury: Using a cut-off value of 250 ng/mL for pNGAL and 100 ng/mL for uNGAL (NGAL+) and presence of AKI (Cr+), patients were further categorized into 4 categories; NGAL-/Cr-, NGAL+/Cr-, NGAL-/Cr+, NGAL+/Cr+ (Table S4).