Table 2. Stages of AKI according to KDIGO.

AKI: acute kidney injury; KDIGO: Kidney Disease Improving Global Outcomes

KDIGO AKI Stage	Serum creatinine	Urine output
Stage 1	serum creatinine 1.5-1.9 x baseline or an increase of ≥ 0.3 mg/dl within 48 h	< 0.5 ml/kg/h for 6-12 hours
Stage 2	serum creatinine 2-2.9 x baseline	< 0.5 ml/kg/h for ≥ 12 hours
Stage 3	increase in serum creatinine to ≥ 4 mg/dl or 3 x baseline or the initiation of renal replacement therapy (RRT)	< 0.3 ml/kg/h for ≥ 24 hours or anuria for ≥ 12 hours