Sweat Test

• Usually, two sweat tests are done to confirm a diagnosis of Reference cystic fibrosis Opens New Window.
• A sweat test can't identify Reference carriers Opens New Window of the cystic fibrosis gene. If your child is diagnosed with cystic fibrosis, you may wish to talk with your doctor about Reference genetic counseling Opens New Window. For more information, see the topic Reference Cystic Fibrosis Carrier Screening.
• Adults generally have higher salt concentrations in their sweat than children. Also, sweat test results in adults can vary widely. This is especially true in women, because the amount of salt in their sweat can vary with the phase of their Reference menstrual cycle Opens New Window. Enough sweat must be collected to get accurate test results.
• If results of a sweat test are positive or unclear (especially in babies), a blood test may be done to detect changes in the genetic material (Reference DNA Opens New Window) that causes cystic fibrosis. Blood test results are usually ready in 10 to 21 days. For more information, see the topic Reference Genetic Test.
• Sweat tests should be done at labs that are certified by the Cystic Fibrosis Foundation (www.cff.org). These labs perform a large number of sweat tests and are skilled at sweat test techniques and interpretation.

© 1995-2011, Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Reference Terms of Use. Reference How this information was developed to help you make better health decisions.