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Table 1 Classification criteria for staging of AKI

From: Urinary [TIMP-2]*[IGFBP7] for early prediction of acute kidney injury after coronary artery bypass surgery

AKI KDIGO stage Number Classification criterion for AKI stage
Increase of serum creatinine Decrease of diuresis or RRT
1 13 (21.7 %) 8 5
2 1 (1.7 %) 1 0
3 5 (8.3 %) 0 5
All (1–3) 19 (31.7 %) 9 10
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