What is blood eosinophil?

Eosinophils are a type of white blood cell that is part of the body's immune system. They are produced in the bone marrow and mature in the thymus gland. Eosinophils are found in the blood, tissues, and organs throughout the body.

Eosinophils are involved in a variety of immune responses, including:

* Defending against parasitic infections

* Regulating allergic reactions

* Fighting off certain types of cancer

* Promoting tissue repair

The normal range of eosinophils in the blood is between 0 and 500 cells per microliter (mcL). Higher-than-normal levels of eosinophils (eosinophilia) can be a sign of a variety of medical conditions, including:

* Parasitic infections

* Allergic reactions

* Certain types of cancer

* Inflammatory diseases

Lower-than-normal levels of eosinophils (eosinopenia) can be a sign of:

* Certain genetic disorders

* Adrenal gland disorders

* HIV/AIDS

* Cancer treatments

If you have any concerns about your eosinophil levels, talk to your doctor.

Here are some additional details about blood eosinophils:

* Eosinophils are the second most common type of white blood cell, after neutrophils.

* Eosinophils are typically about 10-12 micrometers in diameter.

* Eosinophils have a bilobed nucleus and cytoplasmic granules that are filled with eosinophilic (red-staining) material.

* Eosinophils are highly motile and can migrate to sites of infection or inflammation.

* Eosinophils can release a variety of mediators, including cytokines, chemokines, and reactive oxygen species, which help to fight off infection and promote tissue repair.

Eosinophils are an important part of the body's immune system and play a vital role in defending against infection, regulating allergic reactions, and promoting tissue repair.