Hematology

Eosinophils

Normal Range
1% - 4%
Sample Type
Standard
Fasting
No
Unit
%

Eosinophils are a type of white blood cell primarily involved in the response to parasitic infections and allergic diseases. In a Differential Count, the eosinophil percentage helps clinicians distinguish between types of inflammation. They contain granules with cytotoxic proteins intended to kill multicellular parasites but can also cause tissue damage in chronic allergic conditions like asthma or eosinophilic esophagitis.

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Interactive
%

Enter your lab result to see where you stand compared to the standard reference range.

Why Context Matters

Eosinophil counts follow a circadian rhythm (lowest in the morning, highest at night). Additionally, recent use of epinephrine or corticosteroids can sharply decrease eosinophil counts, potentially masking eosinophilia.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Clinical References

Source-of-truth databases and clinical guidelines for Eosinophils:

Research & Guidelines

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Medically Reviewed by Dr. Binoy Babu, MBBS

Board Certified Doctor • 10+ Years Clinical Experience

Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.

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