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  1. WebMD - Better information. Better health.

    WebMD - Better information. Better health.

  2. Eosinophils and Eosinophil Count Test (EOS Blood Test)
    • Diagnosis
    • Overview
    • Treatment
    • Symptoms
    • Results

    If you take a blood test and the results arent in the normal range, your doctor may recommend more tests to figure out the problem. If this happens on a test called a white blood cell differential, you may need to get another blood test called an absolute eosinophil count. You might also get this test if your doctor thinks you have a particular kind of disease. An eosinophil count can help diagnose a few conditions. You might have a high count with the following: If your doctor wants an absolute eosinophil count, youll need a blood test. During the test, a health care worker will put a needle into one of your veins and take out some blood.

    The eosinophil count measures the amount of eosinophils in your blood. Theyre a kind of white blood cell that helps fight disease. The exact role of eosinophils in your body isn't clear, but they're usually associated with allergic diseases and certain infections. They're made in your bone marrow and then travel to different tissues.

    Your eosinophils do two important things in your immune system: curb infections and boost inflammation, which can help you fight off a disease.

    The key is for eosinophils to do their job and then go away. But if instead you have too many eosinophils in your body for a long time, doctors call this eosinophilia, and it can cause chronic inflammation. This can damage tissues. Conditions where there are too many eosinophils are in the body include eosinophilic esophagitis (a disorder in your esophagus) or eosinophilic colitis (in your large intestine). Eosinophilic disorders also can happen in your stomach, small intestine, blood, or other organs. Sometimes, a biopsy will show that you have a high amount of eosinophils in your tissues, but you might not have a high amount in your blood.

    In a lab, a technician will add a special stain to your blood sample, in order to see the eosinophils and count how many you have in every 100 cells. Theyll multiply that percentage by your white blood cell count to get your absolute eosinophil count. Generally, a normal test value is less than 350 cells per microliter (cells/mcL). But because this number might not be the same at every lab, you should talk with your doctor to understand your results.

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