by American Society of Nephrology To determine an individual’s kidney function, clinicians evaluate what’s known as the glomerular filtration rate (GFR), with a GFR above 60 mL/min/1.73 m2 being in the normal range. GFR can be measured (mGFR) or calculated from creatinine and cystatin C blood levels, using estimating equation (eGFR). New research indicates that substantial...