Eosinophils are white blood cells involved in allergic reactions and fighting parasites.
- Normal range (adults)
- 1–6%
- Sample
- Blood
- Fasting
- Not usually needed
- Also called
- Eosinophil, EOS, Eosinophil Count
Eosinophils normal range
| Group | %Same unit in all countries |
|---|---|
| Adults | 1–6 |
Ranges vary slightly between laboratories. The range printed on your own report is the one to go by.
Why is the Eosinophils test done?
They are part of the WBC differential in a Complete Blood Count.
What does a high Eosinophils level mean?
High eosinophils (eosinophilia) usually point to allergy or a parasite infection.
Common causes
- Allergies, hay fever, eczema and asthma
- Intestinal worms and other parasites
- Drug reactions
- Some skin and autoimmune conditions
Diet and lifestyle tips
- Identify and avoid known food or environmental allergens
- Good hand and food hygiene; wash vegetables well
- Ask your doctor about a stool test for parasites and deworming
What does a low Eosinophils level mean?
Low eosinophils are common and usually harmless.
Common causes
- Stress
- Steroid medicines
- Early phase of an acute infection
Diet and lifestyle tips
- No specific changes needed
When should you see a doctor?
See a doctor if eosinophils are high with breathing problems, rash, stomach symptoms or weight loss.
Last updated
This page is for general education and is not a diagnosis. Normal ranges differ between laboratories, so always compare your result with the reference range printed on your own report, and discuss abnormal results with your doctor.