Fractional Excretion of Na calculator is to measure of the percentage of sodium excreted in the urine versus the sodium reabsorbed by the kidney.FENa is not a test, but rather a calculation based on the concentrations of sodium and creatinine in your blood and urine.
Fractional Excretion of Na (FENa) in %=[ (urine Na) / (serum Na) ] x 100 / [ (urine Cr) / (serum Cr) ]
To accurately interpret FENa, patients should not have recently received diuretics. FENa is greater than 1% and usually greater than 3% with acute tubular necrosis and severe obstruction of the urinary drainage of both kidneys. It is generally less than 1% in patients with acute glomerulonephritis, hepatorenal syndrome, and states of prerenal azotemia such as congestive heart failure or dehydration. FENa may also be less than 1% with acute partial urinary tract obstruction
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