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In the normal course of perspiration we do lose some salt. However, some of the salt is reabsorbed from the duct of the sweat glands. This re-absorption does ensure that we don't lose too much salt.

In Cystic Fibrosis this re-absorption mechanism is impaired - perspiration is excessively salty, - salt accumulates on the skin.

Actually, sweat test, - for the determination of salt concentration in perspiration -, is one of the tests used for diagnosing Cystic Fibrosis.

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Q: Why is the skin salty with CF?
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