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

The fractional excretion of sodium (FE Na) is the percentage of the sodium filtered by the kidney which is excreted in the urine.It is measured in terms of plasma and urine sodium, rather than by the interpretation of urinary sodium concentration alone, as urinary sodium concentrations can vary with water reabsorption.Therefore, the urinary and plasma concentrations of sodium must …

2024年10月30日 · The fractional excretion of sodium (FENa) is an assessment of renal sodium handling that is commonly used in the evaluation of acute kidney injury (AKI). Definition – The FENa measures the percent of filtered sodium that is excreted in the urine (see 'Formula for fractional excretion of sodium (FENa)' below).

FENa Calculator. Calculate the fractional excretion of sodium given the serum and urine sodium, and the serum and urine creatinine.

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 tubular necrosis (ATN) as the cause of acute kidney injury (AKI).

FENa has traditionally been considered as lacking validity in patients on diuretics. In this study, FENa (>1%) had a specificity of just 54% in detecting intrinsic kidney injury.

The FENa test is highly effective in diagnosing prerenal azotemia. A FENa value below 1% indicates that the kidneys are conserving sodium in response to reduced blood flow, which is consistent with prerenal azotemia. With a PPV of 90% and an NPV of 95%, the test is a critical tool for early and accurate diagnosis. Acute Tubular Necrosis (ATN)

Although computing the FENa value using the FENa formula or the FENa equation can be quite confusing, you can utilize this FENa calculator to perform the calculation for you. This online tool is easy to understand and using it requires only a few steps.

2022年11月15日 · The fractional excretion of sodium (FENa) measures the percent of filtered sodium that is excreted in the urine. This calculation is widely used to help differentiate prerenal disease (decreased kidney perfusion) from acute tubular necrosis (ATN) as the cause of acute kidney injury (AKI, formerly called acute renal failure).

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 are needed to perform this calculation.