The fractional excretion of potassium normalizes urinary potassium excretion rate for the glomerular filtration rate.
fractional excretion of potassium in percent =
= 100% * ((urine potassium in mEq/L) / (plasma potassium in mEq/L)) / ((urine creatinine in mg/dL) / (plasma creatinine in mg/dL))
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Specialty: Nephrology, Clinical Laboratory