IGFBP7 and acute kidney injury: The median value of [TIMP-2]×[IGFBP7] in patients without AKI was 0.19 (IQR 0.1, 0.34); in patients with AKI stage 1: 0.51 (IQR 0.38, 2.66); 1.24 (IQR 0.56, 3.00) in patients with stage 2 and 3; and 1.35 (IQR 0.76, 3.39) in patients who subsequently received RRT.