White Blood Cell Differential Test

Eosinophils "Eos" (Percent)

Optimal Result: 0 - 6 %.

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)

What does it mean if your Eosinophils "Eos" (Percent) result is too low?

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 does it mean if your Eosinophils "Eos" (Percent) result is too high?

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  

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