Table 2. Staging of AKI.

Stage	sCr	Urine output
1	1.5–1.9 times baseline or	<0.5 mL/kg/h for 6–12 hours
	≥0.3 mg/dL (≥26.5 μmol/L) increase
2	2.0–2.9 times baseline	<0.5 mL/kg/h for ≥12 hours
3	3.0 times baseline or	<0.5 mL/kg/h for ≥24 hours or
	Increase in sCr to ≥4.0 mg/dL (≥353.6 μmol/L) or	Anuria for ≥12 hours
	Initiation of RRT or
	In patients <18 years, decrease in eGFR to <35 mL/min per 1.73 m2

AKI, acute kidney injury; sCr, serum creatinine; RRT, renal replacement therapy; eGFR, estimated glomerular filtration rate.