Immune and inflammation

Eosinophils (absolute eosinophil count)

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Eosinophils often rise with allergies and asthma.

Eosinophils are white blood cells that help fight parasites and take part in allergic reactions and inflammation. Your count is often higher when allergies, asthma, or eczema are active.

Allergies are a common reason for a higher count.

Hay fever, asthma, eczema, and reactions to medications are common reasons eosinophils run high. Parasitic infections are another. A raised count is sometimes found by chance during routine blood work.

A high count that stays high without a clear reason is worth investigating further with a clinician.

Questions

What does a low eosinophil count mean?

Eosinophils are normally present in small numbers, so a low result usually isn't a concern on its own. Corticosteroid medicines and the body's stress response during an acute illness can lower the count.

What happens if my result is high?

It helps to note any recent allergy symptoms, asthma, skin flares, new medications, or travel, and to share these with the clinician reviewing your result. A count that stays high may lead to repeat testing.

Sources and references