Fractional excretion of sodium

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Male urinary system

FE sodium; FENa

A meaningful interpretation of the test can be made only when your urine volume has dropped to less than 500 mL/day.

A FENa of less than 1% indicates decreased blood flow to the kidney, while a FENa greater than 1% (and usually greater than 3%) suggests kidney damage.

Review Date: 11/30/2009
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Herbert Y. Lin, MD, PHD, Nephrologist, Massachusetts General Hospital; Associate Professor of Medicine, Harvard Medical School. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org).

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