Eosinophils %
The share of white blood cells that are eosinophils, involved in allergy and parasite defense.
| Typical reference range | below 6 % |
Ranges vary by laboratory, method, age and sex: always use the range printed on your own report. Why labs differ.
What it measures
Eosinophils combat parasites and participate in allergic inflammation, releasing toxic granule proteins.
Why it matters
Elevated eosinophils suggest allergic conditions, asthma, parasitic infection or drug reactions.
What a high result can mean
High percentages occur with allergies, asthma, eczema, parasitic infections, drug reactions, eosinophilic esophagitis and some autoimmune or blood disorders.
What a low result can mean
Low or zero eosinophils is common and usually not significant; corticosteroids and acute stress suppress them.
What affects the result
Seasonal allergies can raise eosinophils. Interpret with the absolute eosinophil count.
Unit
Usually reported in %.
Also called on lab reports
Eosinophils, Eos, Eos %, Eosinophil %, Eosinophils (%), Eosinophils, Percent
Related tests: White Blood Cells & Differential
This page is educational and does not replace advice from a healthcare professional.