Measurement of the urinary potassium excretion rate in a timed specimen can be used to distinguish renal from nonrenal cause of hypokalemia.


Specimen: 24 hour urine


urinary potassium excretion rate per day =

= (volume of 24 hour urine, in liters) * (urinary potassium in mEq/L)



• An excretion rate more than 20 mEq/24 hours implies potassium "wastage" (inadequate potassium conservation).


To read more or access our algorithms and calculators, please log in or register.