What it is
Eosinophilia is a higher-than-normal number of eosinophils, a type of white blood cell involved in allergic reactions and defense against parasites.
Common causes
Allergies, asthma, drug reactions, parasitic infections, and less commonly certain blood disorders.
Next steps
Interpretation depends on how elevated the count is and your overall clinical picture. Your doctor may order stool studies, allergy tests, or imaging.
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