Before the test

• Give your child any regular medicines as normal. They won’t affect test results.

• Don't use lotion or soap on your child’s arms or legs for 24 hours before the test.

• Bring something to help your child stay warm during the test. You can bring a blanket, sweater, or jacket.

• In an age-appropriate way, let your child know will happen.

During the test

This is a painless test that uses no needles. It takes about 60 minutes to complete. Here’s what you can expect:

• A technician applies an odorless, colorless chemical to a small area on your child’s arm or leg.

• The technician then attaches an electrode to this area. The electrode produces a weak electrical current. This causes sweating. It is painless, but may cause mild tingling or warmth. The electrode stays in place for about 5 minutes.

• The technician removes the electrode, then cleans and dries the area.

• Next, the technician applies filter paper, gauze, or a plastic coil to your child’s skin. This collects sweat for about 30 minutes. During this time your child can move around, eat, play, or relax.

• The collection device is removed and sent to a lab for analysis.

After the test

You and your child can go home after the test. Your child’s healthcare provider will get the test result in a day or two. In rare cases, a child doesn’t produce enough sweat or the test is not clear. The test can be repeated. Or your child can have other tests to confirm a diagnosis.