Eosinophils (abs.)
Immune system healthThe absolute count of eosinophils per liter of blood.
Eosinophils are white blood cells involved in fighting parasitic infections and mediating allergic responses. The absolute count is more clinically meaningful than the percentage, as it directly reflects the body's eosinophilic activity regardless of total white blood cell levels.
Reference range
Source: lab benchmark
Reference ranges may vary between labs and assays. Always interpret results with your healthcare provider.
Why this matters
Eosinophils are your body's specialized defenders against parasites and moderators of allergic inflammation. Optimal range is generally below 4-5%. Elevated levels (eosinophilia) commonly indicate allergies, asthma, eczema, or parasitic infections. Very high levels might suggest autoimmune conditions or certain cancers.
When activated, eosinophils contribute to symptoms like wheezing, skin rashes, and nasal congestion. Monitoring helps assess allergic disease activity and treatment response.
How this connects to other biomarkers
- Eosinophilia (> 0.5 × 10⁹/L) suggests atopy/allergy, parasitic infection, drug reaction, eosinophilic GI/respiratory disease, or eosinophilic granulomatosis with polyangiitis (EGPA — a rare autoimmune blood-vessel disease).
- Marked persistent eosinophilia (> 1.5 × 10⁹/L) for > 6 months defines hypereosinophilic syndrome and warrants tissue and end-organ workup.
- Low Eosinophils accompany Cortisol elevation (acute stress, exogenous steroids).
Included in
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