Absolute Eosinophils
The actual number of eosinophils per microliter of blood.
| Typical reference range | 15–500 cells/uL |
Ranges vary by laboratory, method, age and sex: always use the range printed on your own report. Why labs differ.
What it measures
Absolute eosinophils are WBC multiplied by the eosinophil percentage, quantifying cells involved in allergic inflammation and anti-parasite defense.
Why it matters
Eosinophilia (above 500 cells/uL) points to allergy, parasites, drug reactions or less commonly autoimmune or blood disorders; levels above 1500 warrant evaluation for organ involvement.
What a high result can mean
Causes include allergic rhinitis, asthma, eczema, parasitic infections (especially after travel), drug reactions, eosinophilic GI disorders, adrenal insufficiency and hypereosinophilic syndromes.
What a low result can mean
Low counts are common and usually insignificant; corticosteroids, Cushing's syndrome and acute stress lower them.
What affects the result
Allergy season, steroid use and time of day (higher at night) affect the count.
Units and conversion
Usually reported in cells/uL.
- From x10E3/uL: multiply by 1,000 to get cells/uL
- From K/uL: multiply by 1,000 to get cells/uL
- From 10^3/uL: multiply by 1,000 to get cells/uL
- From x10^9/L: multiply by 1,000 to get cells/uL
- From 10*3/uL: multiply by 1,000 to get cells/uL
- From Thousand/uL: multiply by 1,000 to get cells/uL
- From x10E9/L: multiply by 1,000 to get cells/uL
Also called on lab reports
Eosinophils (Absolute), Eosinophils Absolute, Eos (Absolute), Eos #, Eosinophils, Absolute, AEC, Absolute Eosinophil Count, Eosinophils Abs
Related tests: White Blood Cells & Differential
This page is educational and does not replace advice from a healthcare professional.