TIMP2 and acute kidney injury: When 0.3 (ng/mL)2/1000 was chosen as the cutoff value of urinary [TIMP-2] × [IGFBP7] to predict AKI, the sensitivity and specificity were respectively 0.76 and 0.72 and the AUROC was 0.74 (95% CI, 0.70–0.78) in patients who were tested within 4 hours post-operatively (Table 4).