Table 1.

AKIN definition and staging for acute kidney injury (20)

StageSCr CriteriaUrinary Output Criteriaa
1Increase in SCr of ≥0.3 mg/dl (≥26.4 μmol/L) or increase to ≥150% to 200% (1.5- to 2-fold) from baseline<0.5 ml/kg per hour for >6 hours
2Increase in SCr to more than 200% to 300% (>2- to 3-fold) from baseline<0.5 ml/kg per hour for >12 hours
3Increase in SCr to more than 300% (>3-fold) from baseline (or SCr of ≥4.0 mg/dl (≥354 μmol/L) with an acute increase of at least 0.5 mg/dl (44 μmol/L)<0.3 ml/kg per hour for 24 hours or anuria for 12 hours
  • AKIN, Acute Kidney Injury Network; SCr, serum creatinine.

  • a In the study, oliguria was defined as urinary output <500 ml/24 h.