IGFBP7 and acute kidney injury: In our equation, [TIMP-2]·[IGFBP7] index showed an OR of 3.15 (95% IC 1.60–6.17, p = 0.001) for AKI prediction and 1.85 (95% IC 1.33–2.57, p = 0.001) for AKIN ≥ 2 prediction.