Eosinophils Type of White Blood Cell

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What is it?

White blood cells (WBC) are a vital part of our immune system.  Eosinophils are one of five types of WBCs found in the human body; all are produced by the bone marrow. Eosinophils account for less than 7% of all circulating white blood cells and have two distinct functions: they destroy invading germs and create an inflammatory response, particularly if an allergy is involved. A healthcare professional may recommend an eosinophil count if you’ve already had a blood differential test and the results were abnormal. Specifically, an eosinophil count may be useful in the diagnoses of the following:

            -An allergic reaction

            -Infection by a parasite

            -Cushing’s disease (a disorder caused by too much of the steroid hormone cortisol). 


Optimal range

0.015 - 0.5 cells/uL
0.015 - 0.5 cells/uL


What are low values associated with?

A low number of eosinophils do not usually cause problems as other parts of the immune system can compensate adequately. It may be caused by:

            -Cushing’s disease

            -Bloodstream infection (sepsis)

            -Treatment with corticosteroids

            -Alcohol intoxication 


What are high values associated with?

Eosinophilia (an unusually high number of eosinophils in the blood) is linked to a variety of disorders, including:

            -Allergic disease

            -Parasitic infection

            -Asthma

            -Autoimmune disease

            -Cancers of the blood, such as Leukemia and Hodgkin lymphoma

There are some medications known to cause an increase in eosinophil count, including:

            -Some antibiotics

            -Tranquilizers

            -Appetite suppressants

            -Laxatives that contain psyllium

            -Interferon, a drug used to treat infection  


Biomarker category

White Blood Cells

Other biomarkers in this category

Band Neutrophils, Basophils, Basophils (Percent), Eosinophils, Eosinophils (Percent), Lymphocytes, Lymphocytes (Percent), Monocytes, Monocytes (Percent), Neutrophils, Neutrophils (%), Polymorphs, Segmented Neutrophils, Segmented Neutrophils (Percent), White blood cells (Leucocytes)

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