The eosinophil percentage is the share of white blood cells that are eosinophils. These cells act mainly in allergic reactions and in the response to parasitic infection, and they are drawn into tissues such as the airway and gut lining. The figure speaks for allergic and parasite-directed activity of the immune system.
No readings for this marker yet.
A raised share most often reflects allergic conditions such as hay fever, asthma or eczema, drug reactions, or parasitic infection, and a persistently high value prompts a wider search. A low share carries little weight on its own, since the normal figure already sits near zero, and it falls further with acute stress or steroid use. Repeat testing and a doctor's assessment come before any interpretation.
The count follows a daily rhythm, being higher at night and lower in the morning, and it drops with corticosteroids, acute infection and stress; season and allergen exposure matter as well. It is read together with the absolute eosinophil count and the rest of the differential, and in an allergic or parasitic context alongside targeted testing.
Reference ranges are general adult values and depend on lab, assay, age and sex. For orientation, not diagnosis — discuss results with your doctor.