Absolute Eosinophil Count – Normal Range & Meaning
The absolute eosinophil count measures the exact number of eosinophilic granulocytes per microliter of blood. It helps doctors detect allergies, parasitic infections, and other conditions.
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The absolute eosinophil count measures the exact number of eosinophilic granulocytes per microliter of blood. It helps doctors detect allergies, parasitic infections, and other conditions.
What Are Eosinophils?
Eosinophils (also called eosinophilic granulocytes) are a subtype of white blood cells (leukocytes). They play an important role in the immune system, especially in defending the body against parasites and mediating allergic reactions. Their name comes from the red dye eosin, which is used to stain them in the laboratory.
What Does the Absolute Eosinophil Count Mean?
The absolute eosinophil count (AEC) indicates the exact number of eosinophilic granulocytes per microliter (µl) or per liter of blood. Unlike the relative (percentage) value, the absolute count provides a more precise picture of the true cell burden in the bloodstream.
In adults, the normal range is typically between 100 and 500 cells per microliter of blood (0.1–0.5 × 10⁹/l), though reference ranges may vary slightly between laboratories.
Causes of Elevated Eosinophil Counts (Eosinophilia)
An elevated absolute eosinophil count is referred to as eosinophilia. Common causes include:
- Allergic conditions: hay fever, allergic asthma, atopic dermatitis, food allergies
- Parasitic infections: e.g., roundworms, hookworms, Toxocara
- Skin disorders: psoriasis, pemphigus
- Drug reactions: certain antibiotics, non-steroidal anti-inflammatory drugs (NSAIDs)
- Autoimmune diseases: e.g., eosinophilic granulomatosis with polyangiitis (formerly Churg-Strauss syndrome)
- Malignancies: lymphomas, leukemias, solid tumors
- Hypereosinophilic syndrome (HES): persistently very high eosinophil counts with organ involvement
Causes of Low Eosinophil Counts (Eosinopenia)
A reduced eosinophil count (below 100/µl) is called eosinopenia. It commonly occurs in:
- Acute infections or severe physiological stress
- Use of corticosteroids (e.g., cortisone)
- Cushing syndrome (elevated cortisol levels)
Diagnosis and How the Value Is Measured
The absolute eosinophil count is determined as part of a complete blood count with differential (CBC with differential). This test counts the individual types of leukocytes, including eosinophils, and reports both their absolute number and percentage.
Blood is drawn from a vein, usually in the inner elbow. No special preparation is generally required, though time of day, physical activity, and medications can influence the result.
Clinical Significance and Treatment
An abnormal eosinophil count is not a diagnosis in itself, but rather a diagnostic clue that may prompt further investigation. Treatment always targets the underlying cause:
- For allergies: antihistamines, corticosteroids, allergen immunotherapy
- For parasitic infections: antiparasitic agents (e.g., mebendazole, albendazole)
- For hypereosinophilic syndrome: corticosteroids, imatinib, or other targeted therapies
It is important to interpret an abnormal value in the context of other laboratory findings and clinical symptoms rather than in isolation.
References
- Longo DL et al. - Harrison's Principles of Internal Medicine, 20th edition. McGraw-Hill, 2018.
- Klion AD - Eosinophilia: a pragmatic approach to diagnosis and treatment. Hematology Am Soc Hematol Educ Program. 2015;2015:92-97. PubMed PMID: 26637710.
- World Health Organization (WHO) - Laboratory diagnosis of blood cell disorders. WHO Press, Geneva.
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Related search terms: Absolute Eosinophil Count + Absolute Eosinophil Number + AEC