Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Investopedia / Matthew Collins A reference number is a unique combination of letters and/or ...

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 ...

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.

With three years spent researching, comparing, and testing software products, Tyler Webb is an expert on all things telecommunications. With work featured on GetVoIP.com, he's written over 150 ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Annie Chou Annie Chou is a writer covering home office, cameras, and games.

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 ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...