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Table 1 Measurements used to classify the three Stages of AKI

From: Identifying on admission patients likely to develop acute kidney injury in hospital

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