Eosinophil: A type of white blood cell. They are produced in the bone marrow and migrate throughout the body. Elevated levels of eosinophils may be found in the blood and/or in tissue, often as the result of an allergic response. Abnormally high levels of eosinophils are common in certain parasitic infections, as well as diseases such as asthma, EGID, leukemia and drug allergies.


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Eosinophils: Granular leukocytes with a nucleus that usually has two lobes connected by a slender thread of chromatin, and cytoplasm containing coarse, round granules that are uniform in size and stainable by eosin.2

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  1. Source: RDCRN (NCATS/NIH): rarediseasesnetwork.org/ cms/ cegir/ Learn-More/ Glossary
  2. Source: MeSH (U.S. National Library of Medicine)
  3. Source: NIAID (NIH): niaid.nih.gov/ topics/ EosinophilicDisorders/ Pages/ gastro.aspx

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