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Glomerular filtration rate (GFR) is considered by medical professionals to be the best measure of kidney function. Knowing someone's GFR lets them figure out their stage of kidney disease. Doctors will use this information to plan their patient's treatment.
The DaVita GFR Calculator uses the MDRD4 revised equation. This equation includes modifications from the original MDRD (Modification of Diet in Renal Disease) study.
A.S. Levey, J. Coresh , T. Greene, L.A. Stevens, Y.L. Zhang, S. Hendriksen, J.W. Kusek, F. Van Lente; Chronic Kidney Disease Epidemiology Collaboration. Using standardized serum creatinine values in the modification of diet in renal disease study equation for estimating glomerular filtration rate. Ann Intern Med. 2006 Aug 15;145(4):247–54.