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4. Glomerular Filtration Rate

The glomerular filtration rate or GFR is the best test to measure kidney function and is used to stage the disease. It measures the functionality of the glomeruli, the network of small blood vessels in the kidney that filter waste. The higher the GFR, the better the kidneys are working. In stage 3A, the GFR is 59 to 45; in 3B, it is 44 to 30. For comparison, stage 1 has a GFR of 90 or more.

glomerular filtration rate selvanegra / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.