Is my Eosinophils (%) normal?
Free blood test checker · Standard + longevity-optimal ranges
What is a normal Eosinophils level?
Eosinophils are white blood cells involved in allergic responses and parasitic defense. Normal percentage is 1-4% of total WBC. Elevated eosinophils (eosinophilia) commonly indicate allergies, asthma, drug reactions, or parasitic infections. Above 8% is clinically significant and warrants investigation.
| Range | Values |
|---|---|
| Standard Reference | 1–4 % |
| High Risk | > 8 % |
What causes abnormal Eosinophils levels?
Elevated eosinophils: allergic diseases (asthma, atopic dermatitis, allergic rhinitis), parasitic infections (hookworm, strongyloides, schistosomiasis), drug hypersensitivity (DRESS syndrome), eosinophilic gastrointestinal disorders (EoE), Churg-Strauss syndrome (eosinophilic granulomatosis with polyangiitis), hypereosinophilic syndrome, and certain malignancies (Hodgkin lymphoma). Travel to endemic areas raises suspicion for parasitic causes.
When should you see a doctor?
See your doctor if eosinophil percentage is above 8% or absolute count above 500/µL persistently. Above 1,500/µL (hypereosinophilia) warrants urgent evaluation as eosinophils can damage the heart, lungs, and nervous system. Also consult with symptoms like chronic cough, skin rashes, or swallowing difficulty.
Eosinophils and longevity
Eosinophils are less commonly discussed in longevity contexts but are important for identifying chronic allergic inflammation. Uncontrolled allergic disease contributes to chronic inflammation and impaired quality of life. Eosinophilic esophagitis is increasingly recognized in adults and can impair nutrition if untreated. Optimizing eosinophil levels through allergen management and appropriate treatment supports overall health.
Where to get a Eosinophils test
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Related biomarkers
These biomarkers are often tested alongside Eosinophils for a more complete picture.
Frequently asked questions
What is a normal eosinophil percentage?
What causes high eosinophils?
Are eosinophils related to food allergies?
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Sources: Reference ranges based on AHA/ACC, ADA, and AACE clinical guidelines. Biological variation data from Ricos/Westgard database. Longevity-optimal ranges reflect targets used by preventive and functional medicine practitioners.
Last reviewed: April 2026. This tool provides general health information and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider about your specific results.