Absolute Eosinophil Count (AEC)
Enter total white blood cell count and eosinophil percentage (%) from the differential to obtain the absolute eosinophil count in cells/µL.
Use absolute leukocyte count (e.g., from CBC with differential).
Enter percentage (not decimal). Example: 4% → 4.
Absolute eosinophil count
300 cells/µL
Normal eosinophil count
Absolute eosinophil count <500 cells/µL is within the reference range for most adults.
How to Use This Calculator
Obtain CBC with differential
Ensure white blood cell count and differential are measured from the same sample.
Enter leukocyte count and eosinophil %
Input WBC in cells per microliter and eosinophil percentage as provided on the laboratory report.
Interpret the result
Review the absolute count and severity category to guide further evaluation or management of eosinophilia.
Formula
AEC (cells/µL) = Total WBC (cells/µL) × Eosinophils (%) ÷ 100
Example: WBC 7500, eosinophils 4% → 7500 × 4 ÷ 100 = 300 cells/µL.
Full Description
The absolute eosinophil count quantifies eosinophils in peripheral blood and is essential for diagnosing and grading eosinophilia. Mild elevations often reflect allergic or atopic diseases, while higher counts necessitate evaluation for parasitic infections, drug reactions, autoimmune disorders, or hematologic malignancies. Persistent counts ≥1500 cells/µL can result in organ damage, requiring targeted therapy.
Frequently Asked Questions
What is the normal eosinophil range?
Typically 0–500 cells/µL (0–5%). Values may vary slightly among laboratories.
Should I use absolute or percentage from the lab?
Use the percentage if absolute values are not provided. Many labs already report the absolute eosinophil count directly.
What causes eosinophilia?
Common causes include allergies, asthma, parasitic infections, drug hypersensitivity, connective tissue disease, and hematologic disorders.
How often should I repeat testing?
Frequency depends on clinical context. Repeat counts after treating underlying causes or if symptoms persist.