Classification of Chronic Kidney Disease (CKD)

Stage	GFR, mL/min per 1.73 m2
0	>90  With risk factors for CKD
1	>=90 With demonstrated kidney damage (e.g., persistent proteinuria, abnormal urine sediment, abnormal blood and urine chemistry, abnormal imaging studies).
2	60–89
3	30–59
4	15–29
5	<15