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Eosinophils (Percent)

Blood & blood cell markers

What the test generally measures, and what to ask about it.

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Updated Jul 13, 2026

What is Eosinophils (Percent)?

The share of your white blood cells that are eosinophils, shown as a percentage.

Eosinophils are white blood cells that help respond to allergies and certain infections. This percentage is the proportion version of the eosinophil count and pairs with the absolute eosinophil count that gives the actual number. A higher share can be associated with allergies, asthma, or certain infections. It appears as part of a white blood cell differential.

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Terms of Use.

References

Clinical "Blood Differential Test" MedlinePlus (NIH/NLM). medlineplus.gov/lab-tests/blood-differential.

About our sources

Clinical / professional

Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.

Peer-reviewed research

Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.

History of updates

Published · Jul 13, 2026
First published, written from official sources (final verification pass pending).

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