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.

A T cell count is a blood test that measures the number of T cells, a type of white blood cell crucial for fighting off diseases, especially viral infections. This test helps identify issues with the ...

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Leukocytosis is when you have a higher-than-normal number of white blood cells. White blood cells, also called leukocytes, are important for making sure your body stays healthy. They protect it from ...