Table 1. KDIGO (Kidney Disease: Improving Global Outcomes) criteria for classification of acute kidney injury [14].

Both serum creatinine and urine output criteria should be applied, and the AKI stage should be taken as whichever is the higher.

AKI Stage	Serum Creatinine Increase	Urine Output
1	1.5–1.9 times baseline OR ≥26.5 μmol/L (0.3 mg/dl) increase within 48 hours	<0.5 ml/kg/hour for 6–12 hours
2	2.0–2.9 times baseline	<0.5 ml/kg/hour for ≥12 hours
3	3.0 times baseline OR increase in serum creatinine to ≥353.6 μmol/L (4.0 mg/dl)OR start renal replacement therapy	<0.3 ml/kg/hour for ≥24 hoursOR anuria for ≥12 hours