Search Here


Eosinophils, sometimes called eosinophiles or, less commonly, acidophils, are a variety of white blood cells and one of the immune system components responsible for combating multicellular parasites and certain infections in vertebrates. Along with mast cells and basophils, they also control mechanisms associated with allergy and asthma. They are granulocytes that develop during hematopoiesis in the bone marrow before migrating into blood, after which they are terminally differentiated and do not multiply.


Also Known as: Eosin, Eosino, Eosinophils, Acidophils


Receive all our future posts instantly in your inbox. Enter your email to enroll.

Cells Panel: Neutrophils, Lymphocytes, Monocytes, Eosinophils, Basophils

Structure of Eosinophils:

  • Eosinophils are also 10–12 µm in diameter
  • Neucleus: Bilobed, Clumped Chromatin
  • Cytoplasm: Coarse GrimsonRed Granules
  • The granules of eosinophils stain best with an acidic stain known as eosin.
  • The nucleus of the eosinophil will typically have two to three lobes and, if stained properly, the granules will have a distinct red to orange color.

Functions of Eosinophils:

These cells are born in the bone marrow, and migrate from the peripheral blood system after a few hours, into loose connective tissue in the respiratory and gastointestinal tracts. They phagocytose antigen-antibody complexes. They also produce histaminase, and aryl suphatase B, two enzymes that inactivate two inflammatory agents released by mast cells. A high eosinophil blood count may indicate an allergic reaction.

Eosinophils are also important in killing parasitic worms.

Referance Ranges:

Test NameMaleFemale
Eosinophils1- 6 %1- 6 %

Eosinophils increased in:

  1. Allergy.
  2. Parasitic infestation.
  3. Skin disorders.
  4. Neoplastic diseases like Hodgkin’s lymphoma.
  5. Collagen vascular diseases.

Eosinophil Decreased in:

  1. Cushing’s syndrome.
  2. Stress.

Related Articles:

  • Nervous tissue is the term for groups of organized cells in the nervous system, which […]
  • Muscle tissue is composed of cells that have the special ability to shorten or contract […]
  • Epithelial tissues are widespread throughout the body. They form the covering of all body surfaces, […]
  • Morphology, peripheral blood smear, biochemical tests and preliminary investigations for the diagnosis of iron deficiency […]
  • Ion selective electrode (ISE) is an analytical technique used to determine the activity of ions […]
  • List of Basic Calculations/Formulas Used in Clinical and Medical Laboratories for Generate Results and any […]
  • The presence of two or more embryos in the uterus. Twin and higher gestations have […]
  • Stillbirth is the clinical term for stillbirth used to describe the death of a baby […]

Possible References Used

Leave a Reply

Your email address will not be published. Required fields are marked *

Navigate: Home | Categories | About Us | Authors | Contact Us | Submit News Tips | Advertise | Write for Us
Find us on: Facebook | Twitter | Tumblr | YouTube | Reddit | Pinterest | Instagram
More: RSS | Sitemap | Back to: Top
© 2018-2021 Lab Tests Guide