Fractional excretion of sodium?

Fractional excretion of sodium?
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DefinitionFractional excretion of sodium (FENa) is the amount of salt (sodium) that leaves your body through urine compared to the amount filtered and reabsorbed by the kidney.FENa is not a test, but rather a calculation based on the concentrations of sodium and creatinine in your blood and urine. Urine and blood chemistry tests are necessary to perform this calculation.Alternative NamesFE sodium; FENaHow the test is performedBlood and urine samples are sent to a lab, where they are examined for their salt (sodium) and creatinine levels.For information on how a blood sample is taken from a vein, see venipuncture.For information on giving a urine sample, see clean catch urine sample.How to prepare for the testEat a normal diet with a normal amount of salt, unless otherwise instructed by you
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