An eosinophil blood test is a diagnostic tool used to measure the number of eosinophils, a type of white blood cell, in a person's blood. Eosinophils are part of the immune system and play a role in fighting infections and allergic reactions. Abnormal levels of eosinophils can be a sign of certain medical conditions, such as allergic reactions, infections, and some blood disorders. A healthcare provider may order an eosinophil blood test to help diagnose these conditions or to monitor the effectiveness of treatment. The test is typically performed by drawing a sample of blood from a vein in the arm.
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