Sweat electrolytes is a test that measures the level of chloride in sweat. Sweat chloride test is the standard test used to diagnose cystic fiborsis.
Sweat test; Sweat chloride; Iontophoretic sweat test
How the Test is Performed
A colorless, odorless chemical that causes sweating is applied to a small area on an arm or leg. An electrode is then attached to the spot. A weak electrical current is sent to the area to stimulate sweating.
People may feel a tingling in the area, or a feeling of warmth. This part of the procedure lasts for about 5 minutes.
Next, the stimulated area is cleaned and the sweat is collected on a piece of filter paper or gauze, or in a plastic coil.
After 30 minutes, the collected sweat is sent to a hospital lab to be tested. The collection takes about 1 hour.