Doctors use the glomerular filtration rate (GFR) to measure kidney function. Stage 1, represents slight kidney damage with a normal filtration rate with a GFR number over 9. Stage 2 is a mild decrease in kidney function with the GFR being 60 to 89. A GFR range of 30 to 59 and a moderate reduction in kidney function means you're at Stage 3. When there is severe damage in kidney function, you will be at Stage 2 if your GFR is between 15 and 29. Stage 5 means your GFR has dipped below 15 and you'll need regular dialysis for the rest of your life without a new kidney.

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