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Test: Sweat Testing

A sweat test is used to diagnose cystic fibrosis by measuring the levels of salt in sweat. The procedure is painless and is performed in hospital on an outpatient basis. The production of sweat is stimulated for about 3 minutes using two electrodes. The electrodes are then replaced with a pad, which collects the sweat for the next 30 minutes.

During the test

A small electrical current passes to gel-filled electrodes on the arm to stimulate sweat production.

From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.

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