Fractional excretion of sodium

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Male urinary system

In infants or young children, the area is cleansed with antiseptic and punctured with a sharp needle or a lancet. The blood may be collected in a pipette (small glass tube), on a slide, onto a test strip, or into a small container. Cotton or a bandage may be applied to the puncture site if there is any continued bleeding.

Consume a normal diet with a normal amount of salt. If the collection is being taken from an infant, a couple of extra collection bags may be necessary.

When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.

The test is usually done for patients who are severely ill with acute kidney failure.

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.