Abstract
Estimation of the fractional excretion of filtered sodium (FEFS) is one of several indices that help in distinguishing prerenal azotemia from acute renal failure. It is obtained from measurements of urinary and serum creatinine and sodium. An FEFS value less than 1% (0.01) is consistent with prerenal azotemia; a value greater than 1% is consistent with acute renal failure [1].
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References
Fang LST: Manual of Clinical Nephrology. New York McGraw-Hill Book Co, 1983.
Espinel CH: The FENa test: Use in the diagnosis of acute renal failure. JAMA 1976; 236: 579.
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© 1989 Springer-Verlag New York Inc.
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Doyle, D.J. (1989). Fractional Excretion of Filtered Sodium (FEFS). In: Computer Programs in Clinical and Laboratory Medicine. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-3576-7_21
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DOI: https://doi.org/10.1007/978-1-4612-3576-7_21
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4612-8162-7
Online ISBN: 978-1-4612-3576-7
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