Lab

Eosinophil Count

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Eosinophil Count, Eosinophil, Eosinophilia

  • Characteristics
  1. Forms in Bone Marrow from Myeloblasts as with other Granulocytes (Basophils, Neutrophils, Monocytes)
  2. Function: Response to Allergy and Parasitic Infection
    1. Responds to mast cell, Basophil chemotactic factors
  3. Morphology on Blood Smear
    1. Granulocyte stains brightly with Eosin Stain
  • Interpretation
  • Normal
  1. Range: 1-4%
  • Causes
  • Increased (Eosinophilia)
  • Evaluation
  • Eosinophilia (Eosinophils >500/mm3)
  1. See Leukocytosis
  2. History and potential causes
    1. Travel history
    2. New medications
  3. Diagnostics (consider)
    1. Dermatitis biopsy (if present)
    2. Consider allergy and immunology Consultation or testing
    3. Consider Parasite testing (e.g. stool Ova and Parasites)