There are 5 stages of chronic kidney failure based on glomerular filtration rate (GFR): 1 - Normal or high GFR with kidney damage  2 - Mild loss of kidney function with GFR 60-89 mL/min 3 - Moderate loss with GFR 30-59 mL/min  4 - Severe loss with GFR 15-29 mL/min 5 - End-stage kidney failure with GFR <15 mL/min