IGFBP7 and acute kidney injury: Preoperative levels of urinary L-FABP (P = 0.005), [TIMP-2] × [IGFBP7] (P = 0.007), clusterin (P < 0.001), NAG (P = 0.005) and albumin (P < 0.001) were significantly higher in the AKI group than in the non-AKI group (Table 1).