Fractional excretion of sodium

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Male urinary system

FE sodium; FENa

The urine sample has no risk. The risks of drawing blood include:

• Excessive bleeding
• Fainting or feeling light-headed
• Hematoma (blood accumulating under the skin)
• Infection (a slight risk any time the skin is broken)
• Multiple punctures to locate veins

• The test is only of value in specific circumstances, such as sudden reduced urine output.
• Use of diuretic medicines before performing the tests may give misleading results.

Review Date: 02/03/2006
Reviewed By: Charles Silberberg, DO, Private Practice specializing in Nephrology, Affiliated with New York Medical College, Valhalla, NY. Review provided by VeriMed Healthcare Network.