This video shows children what happens in a sweat test. The physiologist explains they do the test to diagnose or rule out Cystic Fibrosis. Annelise first has electrodes on her arm and then a sweat collector. The test doesn't hurt but she feels lots of tingles in her arm. Parents can watch this video themselves or together with their child before the appointment depending on the age and ability of the child. The What? Why? Children in Hospital charity makes videos to help families prepare for tests in hospital.

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