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Table 2 Risk, injury, failure, loss of kidney function, End-stage kidney disease (RIFLE) [11], Acute Kidney Injury Network (AKIN) [7], and Kidney Disease Improving Global Outcomes (KDIGO) [12] classifications

From: Complete blood count in acute kidney injury prediction: a narrative review

Class/stage SCr/GFR UO
RIFLE AKIN KDIGO RIFLE AKIN KDIGO
Risk/1a ↑ SCr X 1.5 or ↓ GFR > 25% ↑ SCr ≥ 26.5 μmol/l (≥ 0.3 mg/dl) or ↑ SCr ≥ 150 to 200% (1.5 to 2X) ↑ SCr ≥ 26.5 μmol/l (≥ 0.3 mg/dl) or ↑ SCr ≥ 150 to 200% (1.5 to 2X) < 0.5 ml/kg/h (> 6 h) < 0.5 ml/kg/h (> 6 h) < 0.5 ml/kg/h (> 6 h)
Injury/2a ↑ SCr X 2 or ↓ GFR > 50% ↑ SCr > 200 to 300% (> 2 to 3X) ↑ SCr > 200 to 300% (> 2 to 3X) < 0.5 ml/kg/h (> 12 h) < 0.5 ml/kg/h (> 12 h) < 0.5 ml/kg/h (> 12 h)
Failure/3a ↑ SCr X 3 or ↓ GFR > 75% or if baseline SCr ≥ 353.6 μmol/l (≥4 mg/dl) ↑ SCr > 44.2 μmol/l (> 0.5 mg/dl) ↑ SCr > 300% (> 3X) or if baseline SCr ≥ 353.6 μmol/l (≥ 4 mg/dl) ↑SCr ≥ 44.2 μmol/l (≥ 0.5 mg/dl) or initiation of renal replacement therapy ↑ SCr > 300% (> 3X) or ↑SCr to ≥ 353.6 μmol/l (≥ 4 mg/dl) or initiation of renal replacement therapy < 0.3 ml/kg/h (> 24 h) or anuria (> 12 h) < 0.3 ml/kg/h (24 h) or anuria (12 h) < 0.3 ml/kg/h (24 h) or anuria (12 h)
  1. SCr serum creatinine, GFR glomerular filtration rate, UO urine output, RIFLE Risk, Injury, Failure, Loss of kidney function (dialysis dependence for at least 4 weeks), End-stage kidney disease (dialysis dependence for at least 3 months), AKIN Acute Kidney Injury Network, KDIGO Kidney Disease Improving Global Outcomes
  2. aRisk class (RIFLE) corresponds to stage 1 (AKIN and KDIGO), Injury class (RIFLE) corresponds to stage 2 (AKIN and KDIGO), and Failure class (RIFLE) corresponds to stage 3 (AKIN and KDIGO)