Table 11.

Staging system for acute renal injury^3,40

Stage	Serum creatinine criteria	Urine output criteria
1	Increase in serum creatinine to 150–200% (1.5–1.99× increase compared with baseline) OR increase of ≥0.3 mg/dL (≥26.4 µmol/L)	Less than 0.5 mL/kg/h for more than 6 but <12 h
2	Increase in serum creatinine to 200–300% (2.0–2.99× increase compared with baseline)	Less than 0.5 ml/kg/h for more than 12 but <24 h
3	Increase in renal creatinine to ≥300% (>3× increase compared with baseline) OR serum creatinine of ≥4.0 mg/dL (≥354 µmol/L) with an acute increase of at least 0.5 mg/dL (44 µmol/L)	Less than 0.3 mL/kg/h for 24 h OR anuria for 12 h

Increase in creatinine must occur within 48 h.

Patients requiring renal replacement are considered to meet Stage 3 criteria, irrespective of other criteria.