FABP1 and acute kidney injury: Of 77 patients, 28 patients (36.4%) developed AKI after surgery. Area under the curve of ROC [AUC-ROC] for L-FABP at 4 h 0.72 and NAG 0.75. Combined these 2 biomarkers can detect AKI with higher accuracy than either biomarker measurement alone (AUC-ROC 0.81).