Table 3.

Acute Kidney Injury Staging

Stage	Serum Creatinine	Urine Output
1	Increase 1.5-1.9 times the baseline; or absolute increase ≥26.5μM	<0.5 ml/kg/h (6-12 hrs)
2	Increase 2.0-2.9 times the baseline	<0.5 ml/kg/h (>12 hrs)
3	Increase ≥3.0 times the baseline; or absolute increase ≥353.6μM; or initiation of kidney replacement therapy	<0.3 ml/kg/h (>24 hrs); or anuria (≥12 hrs)

Only relative serum creatinine change is assessed in the CKD-TUNED study when evaluating short-term changes in kidney function.