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Table 1 Definition and staging of AKI

From: Role of kidney injury in sepsis

Definition AKI is defined as any of the following
  1) Increase in SCr by >0.3 mg/dL within 48 h
  2) Increase in SCr to >1.5 times baseline, which is known or presumed to have occurred within the prior 7 days
  3) Urine volume <0.5 mL/kg/h for 6 h
Severity Serum creatinine Urine output
 Stage 1 1.5–1.9 times baseline, or <0.5 mL/kg/h for 6–12 h
  >0.3 mg/dL increase  
 Stage 2 2.0–2.9 times baseline <0.5 mL/kg/h for >12 h
 Stage 3 3.0 times baseline, or <0.3 mL/kg/h for >24 h, or
  Increase in SCr to >4.0 mg/dL, or Anuria for >12 h
  Initiation of renal replacement therapy  
  1. SCr serum creatinine