Table 1: Classification of CKD defined by KDOQI.

Stage State of kidney function Classification by severity by GFR 1 Kidney damage with normal or increasing in GFR GFR 90 2 Kidney damage with mild decreasing in GFR GFR of 60–89 3 Moderate with decreasing in GFR GFR of 30–59 4 Severe with decreasing in GFR GFR of 15–29 5 Kidney failure GFR < 15 (or dialysis)