MEDICALHematologyHealth Calculator
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Absolute Eosinophil Count

AEC measures the actual number of eosinophils per microliter of blood. It helps diagnose allergies, monitor asthma, detect parasitic infections, and identify eosinophilic disorders.

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Normal: 40-450 cells/μL Mild eosinophilia: 450-1,500 Hypereosinophilia: >5,000

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Why: AEC is more accurate than percentage when WBC is abnormal. It guides allergy workup, parasite screening, and eosinophilic disorder evaluation.

How: AEC = WBC × (eosinophil % ÷ 100). Normal: 40-450 cells/μL. Hypereosinophilia (>5,000) requires urgent evaluation.

Normal: 40-450 cells/μLMild eosinophilia: 450-1,500
Sources:UpToDateASH

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🤧 Allergic Rhinitis Patient

Young adult with seasonal allergies and mild eosinophilia

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🦠 Parasitic Infection Case

Traveler returned from endemic area with GI symptoms and marked eosinophilia

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🍽️ Eosinophilic Esophagitis

Patient with dysphagia and food impaction, moderate eosinophilia

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⚠️ Hypereosinophilic Syndrome

Patient with persistent severe eosinophilia and multi-organ involvement

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💊 Steroid-Suppressed Patient

Patient on chronic corticosteroids with suppressed eosinophil count

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Sample Clinical Scenarios

🤧 Allergic Rhinitis Patient

Young adult with seasonal allergies and mild eosinophilia

Click to use this example

🦠 Parasitic Infection Case

Traveler returned from endemic area with GI symptoms and marked eosinophilia

Click to use this example

🍽️ Eosinophilic Esophagitis

Patient with dysphagia and food impaction, moderate eosinophilia

Click to use this example

⚠️ Hypereosinophilic Syndrome

Patient with persistent severe eosinophilia and multi-organ involvement

Click to use this example

💊 Steroid-Suppressed Patient

Patient on chronic corticosteroids with suppressed eosinophil count

Click to use this example

Enter Lab Values

RequiredCBC Values

Total white blood cell count from CBC
Eosinophil percentage from differential

Patient Demographics (Optional)

Patient age for reference range interpretation
Patient gender

Clinical Context (Optional)

Main presenting symptoms
Known allergies or atopic conditions
Current asthma diagnosis
Risk of parasitic infection
Recent travel to endemic areas
Current skin conditions

Medical History

Current medication use
Current corticosteroid therapy

For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.

🏥 Health Facts

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AEC = WBC × (eos % ÷ 100)

— CBC

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Normal: 40-450 cells/μL

— Lab reference

What is Absolute Eosinophil Count (AEC)?

The Absolute Eosinophil Count (AEC) measures the actual number of eosinophils in the blood per microliter. Eosinophils are a type of white blood cell involved in allergic reactions, parasitic infections, and inflammatory conditions. Unlike the eosinophil percentage, the AEC provides a more accurate assessment of eosinophil levels, especially when the total white blood cell count is abnormal.

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Eosinophil Function

Eosinophils combat parasites, modulate allergic responses, and participate in tissue remodeling and inflammation.

Key Functions:

  • Parasite destruction
  • Allergic response modulation
  • Tissue repair
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Normal Ranges

Normal AEC ranges from 40-450 cells/μL in healthy adults, representing 1-4% of total white blood cells.

Reference Values:

  • Normal: 40-450 cells/μL
  • Percentage: 1-4% of WBC
  • Varies slightly by lab
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Why AEC Matters

AEC is essential for diagnosing allergies, monitoring asthma, detecting parasitic infections, and identifying eosinophilic disorders.

Clinical Uses:

  • Allergy diagnosis
  • Asthma monitoring
  • Parasite detection

How to Calculate AEC

The Absolute Eosinophil Count is calculated from a Complete Blood Count (CBC) with differential by multiplying the total white blood cell count by the eosinophil percentage.

Calculation Method

AEC Formula

AEC (cells/μL) = WBC (cells/μL) × Eosinophil (%) ÷ 100

Example: WBC 9,000 × 5% ÷ 100 = 450 cells/μL

When to Check AEC

🤧

Allergic Conditions

Allergic rhinitis, asthma, eczema, and food allergies often elevate eosinophils.

🦠

Parasitic Infections

Tissue-invasive parasites like helminths cause marked eosinophilia.

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Eosinophilic GI Disorders

EoE and other eosinophilic GI conditions require AEC monitoring.

AEC Classification

Eosinopenia: <40 cells/μL
Normal: 40-450 cells/μL
Mild Eosinophilia: 450-1,500 cells/μL
Moderate: 1,500-5,000 cells/μL
Severe (Hypereosinophilia): >5,000 cells/μL
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