Table 1.

Criteria used to identify and stage acute kidney injury

Criteria	Time interval
	AKIN	KDIGO
Stage 1
Increase in serum creatinine ≥ 1.5 × above baseline	48 h	7 days
Absolute increase in serum creatinine ≥ 0.3 mg/dL (26.4 mmol/L)	48 h	48 h
Stage 2
Increase serum creatinine ≥ 2 × above baseline	48 h	7 days
Stage 3
Absolute increase in serum creatinine ≥ 4 mg/dL (354 mmol/L)	48 h	7 days
Increase serum creatinine ≥ 3 × above baseline	48 h	7 days

AKIN: Acute Kidney Injury Network; KDIGO: Kidney Disease Improving Global Outcomes