Cause of High Eosinophil Count

Cause of High Eosinophil Count


An increase in the number of eosinophil, a type of white blood cell, is commonly associated with an allergy or infection. Eosinophil count can be seen in a routine complete blood count.

@healthbiztips by Arlene Gentallan

High eosinophil count can signify a number of reasons:

  • infection caused by parasitic worm (such as ascaris and hookworm)
  • allergy
  • asthma
  • allergic rhinitis
  • atopic dermatitis
  • automimmune disease
  • hay fever
  • drug allergy
  • eczema
  • cancer
  • fungal infection
  • cushing syndrome
  • lymphoma
  • leukemia
  • lupus
  • organ transplant rejection
  • adrenal insufficiency
  • addison's disease
  • mastocytosis

Eosinophilia is a condition in which eosinophil count is more than 500 µl.

Hypereosinophilic syndromes (HES) is a rare condition in which eosinophil count is high (more than 1500/µl) and persists for 6 months or more. It is associated with damage to organ.

Eosinophil composes about 1-3% of white blood cells. Eosinophils are produced in the bone marrow which later migrates to tissues where they can last for 8 to 12 days.


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