GFR Calculator

National Kidney Fundation

http://www.kidney.org/professionals/physicians/

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GFR Calculator

Glomerular filtration rate (GFR) is the best overall index of kidney function. Normal GFR varies according to age, sex, and body size, and declines with age. NKF's KDOQI clinical practice guidelines recommend the MDRD Study equation to estimate GFR.

http://www.kidney.org/professionals/kdoqi/gfr_calculator.cfm