Table 1.

Measurements used to classify the three Stages of AKI

Stage	Serum Creatinine	Urine output
1	1.5–1.9 x baseline creatinine, or ≥ 26.4 μmol/l within 48 h	< 0.5 ml/kg/hr. for 6–12 h
2	2.0–2.9 x baseline creatinine	< 0.5 ml/kg/hr. for ≥12 h
3	≥ 3.0 times the baseline, or ≥ 354 μmol/l, or initiation of renal replacement therapy	< 0.3 ml/kg/hr. for ≥24 h, or anuria ≥12 h