Cystatin C-based equations for estimating glomerular filtration rate do not require race or sex coefficients.
Estimation or measurement of glomerular filtration rate (GFR) is generally required for optimal treatment of patients. Plasma creatinine has been used for estimation of GFR since 1926 and plasma cystatin C since 1979. The creatinine level is strongly dependent upon muscle mass and as the average muscle mass of dif- ferent populations may vary, creatinine-based GFR-estimating equations have since 1
