Eosinophils
Eosinophils are white blood cells that help fight parasitic infections and play a role in allergic reactions and inflammation.
Category: Complete Blood Count
Also known as: eosinophils, eos, eosinophil %, eozinofili
Reference range: 1–4 % (Source: ABIM)
Standard unit: %
High values may indicate
High eosinophils (eosinophilia) may indicate allergies, asthma, parasitic infections, drug reactions, or eosinophilic disorders.
Low values may indicate
Low eosinophils are generally normal. Very low levels may occur with Cushing's syndrome or acute stress.
Frequently asked questions
- What is a normal Eosinophils level?
- A typical reference range for Eosinophils is 1–4 % (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Eosinophils measured in?
- Eosinophils is most commonly reported in %. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Eosinophils reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Eosinophils over time?
- Yes. Upload results from any lab and BloodId charts your Eosinophils over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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