Fractional Excretion of Sodium (FENa) Calculator

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Disclaimer: Diagnosis is usually made clinically. If the score from the calculator indicates that you might be at risk please consider visiting a doctor for further evaluation.






Fractional excretion of sodium (FENa) is the amount in percetange  of sodium which  is filtered by kidneys that than is released  in the urine. FENa is not a test but is formula to calculate the blood and urine slat and creatine concentration. Both urine an blood samples are taken to the lab to examined because to make the calculation the results of both are needed.

This calculation  can be  imporantant for the evaluation for acute kidney failure on the factors for low urine extratrion.If the evalutiom indicates low  fractional exretion which may indicate  a reduction in  effective circulating volume. Higher levels may indicate wasting of sodium and the reason may be to acute tubular necrosis or causes of kidney failure.

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