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Eosinophils are a type of white blood cell that are responsible for removing parasitic infections and regulating inflammation to mark an infected site. They also play a role in allergy and in asthma.

What might a high result mean?

Elevated levels of eosinophils can occur in response to infection, in particular in parasitic infections of the intestines, such as worms. Levels of this white blood cell rise in order to fight off the infection.

Elevated levels of eosinophils can also arise when the body induces greater inflammation than necessary, as is the case in asthma and allergic responses as well as in autoimmune diseases such as rheumatoid arthritis and lupus.