Overview:

Eosinophils are involved in allergic reactions, defense against parasitic infections, and inflammation. An abnormal eosinophil count can be a sign of underlying health issues, such as asthma, allergies, parasitic infections, or autoimmune disorders.

Normal Range:

• Adults: 0.0 to 0.5 x 10⁹/L (0 to 500 cells per microliter)
• Children: The normal range may vary slightly with age.

Ranges may vary slightly depending on the laboratory and its methods.

• Normal Eosinophil Count:

  • Indicates a healthy immune response. Normal counts suggest no significant allergic or parasitic conditions.

• Elevated Eosinophil Count (Eosinophilia):

  • Mild: 500-1,500 cells/µL.
  • Moderate: 1,500-5,000 cells/µL.
  • Severe: >5,000 cells/µL.
  • Possible Causes:
    • Allergic reactions (e.g., asthma, hay fever)
    • Parasitic infections (e.g., roundworm, hookworm)
    • Autoimmune diseases (e.g., eosinophilic granulomatosis with polyangiitis)
    • Certain cancers (e.g., Hodgkin's lymphoma)
    • Drug reactions

• Low Eosinophil Count (Eosinopenia):

  • Possible Causes:
    • Acute bacterial infections
    • Cushing's syndrome
    • Use of corticosteroids
    • Stress or trauma

• Blood Sample: A small amount of blood is drawn from a vein, usually in the arm.