Talk:Fractional excretion of sodium
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I'm just learning those concept so I may be wrong...
In this article, the mathematical equation seems right, but I don't see how to relate the two "other" way of computing FE (that are discuss in text just before the equation). The fractional excretion value are a percentage (no unit) but the two suggested way have units :
(1) "FENa can be calculated by multiplying the plasma sodium concentration by the glomerular filtration rate"
GFR (ml/min) X [Na]plasma (mmol/ml) = mmol/min
(2) "It may also be calculated by multiplying the urine sodium concentration by the urinary flow rate"
[Na]urine (mmol/ml) X Vurine (ml/min) = mmol/min
Could you explain more in detailled how those way of computing the FE are good ? is there an approximation somewhere that is not discuss ?
thank you