CST3 and acute kidney injury: Urinary NGAL, KIM-1, L-FABP, IL-18, NAG and cystatin C demonstrate modest discriminative performance (AUCs < 0.75 for NAG and cystatin C, and < 0.70 for KIM-1, NGAL, IL-18 and L-FABP) for AKI prediction within 24 h after cardiac surgery [54].