The Fractional Excretion of Sodium (FENa) determines if renal failure is due to pre-renal, intrinsic, or post-renal pathology.

FENa is calculated in two parts—figuring out how much sodium is excreted in the urine, and then finding its ratio to the total amount of sodium that passed through (aka "filtered by") the kidney. …

FENa is the percentage of the sodium filtered by the kidney, which is excreted in the urine. This value is widely used to help differentiate pre-renal disease (decreased renal perfusion) from acute …

Learn how the fractional excretion of sodium (FENa) test helps diagnose kidney issues, including acute kidney injury. Understand its importance, procedure, and results.

Nov 15, 2022 · FENa could play a supportive role in the diagnosis of hepatorenal syndrome, a disorder that is characterized by oliguria, avid sodium reabsorption, urine Na <10 mEq/L, and …

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Jul 24, 2025 · Fractional Excretion of Sodium (FENa) quantifies the percentage of filtered sodium excreted in urine, helping differentiate causes of acute kidney injury (AKI).

Jul 5, 2025 · By calculating the fractional excretion of sodium (FeNa), clinicians can rapidly differentiate between prerenal and intrinsic renal causes of AKI. In this guide, you’ll learn how to …

FENa represents the percentage of sodium that is filtered by the kidneys and then excreted in urine. Because it is dependent on the level of filtration, it offers indirect information about the renal function.

Fractional excretion of sodium (FENa) is not a test. Instead it is a calculation based on the concentrations of sodium and creatinine in the blood and urine. Urine and blood chemistry tests …