The Sanford Fieldhouse's sweat test helps determine exactly what fuel athletes need to perform at their top level.

Learn about what the sweat electrolyte test is for and how it works. This article discusses how it helps diagnose cystic fibrosis in infants and who might need the test.

The test measures chloride levels in sweat to confirm or rule out a diagnosis of cystic fibrosis. It's regarded as the gold standard for diagnosing the condition.

McCarthy took the test last fall, realized he wasn’t properly hydrating his body and has worked diligently to fix it. On Thursday in swampy Memphis, he opened with a 66.