Eosinophils · high result
What does a high Eosinophils mean?
Short answer
High eosinophils (eosinophilia) most often point to allergy — asthma, eczema, hay fever, drug reactions — or a parasitic infection, especially after travel. Some medications, autoimmune conditions and adrenal insufficiency raise them; persistent marked elevation (above ~1.5 × 10³/µL) is evaluated for eosinophilic disorders and, rarely, blood cancers.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
What is the normal range for Eosinophils?
- age 18+: 1.00 – 4.00 %
Often reflects allergies, asthma, parasites, or certain medications.
Full reference table, citations and testing options: Eosinophils biomarker page.
What are the common causes of high Eosinophils?
- Allergic disease: asthma, eczema, allergic rhinitis, food allergy
- Drug reactions (antibiotics, NSAIDs, anticonvulsants)
- Parasitic infection (travel, undercooked food, pets)
- Eosinophilic esophagitis, inflammatory bowel disease, vasculitis
- Adrenal insufficiency
- Hypereosinophilic syndrome, lymphoma, leukemia (rare)
What symptoms go with high Eosinophils?
- Wheeze, itch, rash, nasal congestion
- Digestive symptoms after travel
- Often none
What do clinicians usually check next?
- Absolute eosinophil count and a repeat
- Allergy history and medication review
- Stool ova and parasites, travel-related testing
- Hematology referral if persistently above ~1.5 × 10³/µL
How do you recheck Eosinophils?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| General Wellness Panel | Panel · 4 tests | $89.99 | Yes | 1–3 business days |
| Blood Clotting Panel | Panel · 4 tests | $149.99 | No | 3–7 business days |
| Baseline Anemia Panel | Panel · 5 tests | $74.99 | Yes | 2–4 business days |
| CBC with Differential | Test · 14 biomarkers | $21.99 | No | 1–3 business days |
Common questions
Is a slightly high eosinophil percentage a concern?
A percentage a point or two above range with a normal absolute count is almost always allergy or seasonal variation. Persistent absolute counts above 1.5 need investigation.
Sources
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.