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Fractional Excretion of Sodium

The test is done in patients with acute renal failure to evaluate the probable type of renal failure.

 Urinary Sodium UNa(mmol/L)
 Serum Sodium PNa(mmol/L)
 Urinary Creatinine UCr(mg/dl)
 Serum Creatinine PCr(mg/dl)
Fractional Excretion of Sodium(FENa)%


Normal Values

   1% to 3%
  • Normal or Below normal values suggest:
    • bleeding, other causes of low blood volume, or insufficient blood flow to the kidneys (pre-renal failure; prerenal azotemia).
    • contrast nephropathy and pigment nephropathy.
  • Above the normal range suggests:
    • persons with pre renal failure and on diuretic therapy.
    • chronic renal insufficiency with impaired sodium absorption.
    • acute tubular necrosis or renal causes like glomerulonephritis.


The calculators provided in this section are for information purposes only. They are not meant to be a substitute for professional advise and are not to be used for medical diagnosis. The calculators provide only approximate values of the indices indicated and therefore should not be used for clinical or diagnostic purposes. www.webhealthcentre.com makes no claims whatsoever, expressed or implied, about the authenticity, accuracy, reliability, completeness or timeliness of the material, software, text, graphics and links given in this section. In no event shall www.webhealthcentre.com, its suppliers, affiliates or any third parties be liable in any manner whatsoever for any damages arising upon use of any information given in this section in any manner whatsoever.

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