What is Eosinophils %?
Eosinophil percentage tells you what proportion of your white blood cells are eosinophils relative to other immune cells, such as neutrophils, lymphocytes, and monocytes.
Looking at absolute eosinophil count and eosinophils percentage together helps provide a clearer picture of immune activity:
- If both eosinophil percentage and absolute count are elevated, the body may be producing more eosinophils in response to allergies, parasites, or inflammation.
- If the percentage of eosinophils is elevated but the absolute count is normal, it may indicate that other white blood cell types have decreased rather than eosinophils increasing.
Why Does Eosinophils % Matter?
- Assess the proportion of eosinophils relative to other white blood cells
- Reflects shifts in immune balance, particularly allergic and inflammatory responses
- Help detect serious health conditions, such as cancer, when very high levels are persistent
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How to Interpret Eosinophils %
(Ranges may vary slightly by lab)
Standard reference ranges represent the middle 95% of healthy individuals but don’t necessarily reflect levels associated with longevity. Optimal ranges are derived from clinical guidelines, peer-reviewed research, and real-world outcomes data, with an emphasis on levels associated with peak functioning and reduced disease risk. They may not reflect optimal immune balance or low inflammatory burden.
What Healthy Eosinophil Percentage Supports
- More balanced immune responses to allergens and infections
- Faster recovery from illness
- Improved respiratory and immune health
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Low Eosinophils %
Low eosinophil percentages often occur during acute illness, physiological stress, or when the immune system is responding to infection. Symptoms usually reflect the underlying condition affecting the immune system.
Symptoms:
- Fever
- Fatigue
- Recurring infections
- Digestive issues
- Skin rashes
Causes:
- Acute infections
- Stress
- Certain medications (e.g., corticosteroids)
- Cushing’s syndrome
- Bone marrow disorders
Healthspan Impacts:
- May reflect acute physiological stress and has been associated with worse outcomes in acute illness settings
- Linked to increased hospitalization risk in respiratory disease
High Eosinophils %
High eosinophil percentages often reflect allergic or inflammatory immune responses. Symptoms often relate to the underlying allergic or inflammatory condition.
Symptoms:
- Itchy skin rashes or hives
- Sneezing, runny nose, watery eyes
- Wheezing or shortness of breath
- Stomach pain or nausea
- Fatigue
Causes:
- Allergies and asthma
- Parasitic infections
- Autoimmune disease
- Environmental allergens
- Atopic conditions
Healthspan Impacts:
- Linked to poorer outcomes, increased in-hospital mortality, higher intensive care unit admission rates, and longer hospital stays1
- Increased risk of acute exacerbation of chronic obstructive pulmonary disease2
- Higher risk of chronic inflammation3
How Hone Treats Out of Range Eosinophils %
Your Hone physician will evaluate your eosinophil percentage alongside absolute eosinophil count, other markers in a complete blood count (CBC), your symptoms, and your overall health to determine the root cause, then design a personalized treatment plan.
- Corticosteroids* – to reduce inflammation and lower eosinophil levels
- Biologicals* – to treat eosinophilic asthma, eosinophilic esophagitis, and hypereosinophilic syndrome
- Immunosuppressants* – to treat more severe or persistent cases of elevated eosinophils
- Antibiotics* – to treat confirmed bacterial infections
Note: *Your Hone Physician does not prescribe these treatments but will recommend further evaluation and help coordinate care with your primary care provider when medical treatment is indicated.
- Identify and eliminate potential food allergens7
- Adopt an anti-inflammatory diet
- Increase omega-3 intake (salmon, flaxseeds)
- Reduce acidic and processed, sugary foods
- Reduce environmental allergens by using HEPA air filters, keeping your home clean, and regularly washing bedding
- Manage chronic stress
- Quit smoking
- Limit alcohol
- Get regular moderate-intensity activity such as brisk walking, cycling, or swimming
Lv, M. Y., et al. (2021). The lower the eosinophils, the stronger the inflammatory response? The relationship of different levels of eosinophils with the degree of inflammation in acute exacerbation chronic obstructive pulmonary disease (AECOPD). Journal of Thoracic Disease.
↑Vedel-Krogh, S., et al. (2016). Blood Eosinophils and Exacerbations in Chronic Obstructive Pulmonary Disease. The Copenhagen General Population Study. American journal of respiratory and critical care medicine.
↑Quirce, S., et al. (2023). Management of eosinophil-associated inflammatory diseases: The importance of a multidisciplinary approach. Frontiers in Immunology.
↑Hernández-Colín, D. D., et al. (2023). Serum Vitamin D Is Inversely Associated with Blood Eosinophil Count Among Adults with Allergic Asthma. Thoracic Research and Practice.
↑Suzuki, M., et al. (2021). Role of intracellular zinc in molecular and cellular function in allergic inflammatory diseases. Allergology International.
↑Jusufovic, E., et al. (2019). Curcumin Improves Therapy of Moderate Partially Controlled Asthma: Placebo-controlled, single blind study. European Respiratory Journal.
↑Visaggi, P., et al. (2021). Dietary Management of Eosinophilic Esophagitis: Tailoring the Approach. Nutrients.
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Reviewed for Accuracy by Our Medical Review Board
This biomarker information has been reviewed by a member of Hone’s medical review board. As part of the medical review team, physicians fact-check this content against the latest research and their own experience treating their patients.
Ashley Winter, M.D., is a board-certified urogynecologist trained at Weill Cornell and Cleveland Clinic. She specializes in female and male sexual dysfunction, urinary issues, genital pain, and hormone therapy.
James Staheli, D.O., is the Medical Director for Broad Health, Hone Health’s affiliated medical practice and a family medicine doctor in Atlanta, Georgia.
