Fractional Excretion of Sodium
The test is done in patients with acute renal failure to evaluate the probable type of renal failure.
1% to 3%
- Normal or Below normal values suggest:
- bleeding, other causes of low blood volume, or insufficient blood flow to the kidneys (pre-renal failure; prerenal azotemia).
- contrast nephropathy and pigment nephropathy.
- Above the normal range suggests:
- persons with pre renal failure and on diuretic therapy.
- chronic renal insufficiency with impaired sodium absorption.
- acute tubular necrosis or renal causes like glomerulonephritis.
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