Eosinophils are a kind of white blood cell that helps fight disease. The exact role of eosinophils in your body isn't clear, but they're usually linked with allergic diseases and certain infections.

You might need it to check your levels of calcium, an essential mineral you need to be healthy. This often routine procedure helps screen you for conditions and diseases that may affect your bones, ...

The 2016 Indianapolis 500 winner (photo) was fastest in both sessions Wednesday and overall in the two-day Open Test at the 1-mile desert oval.