A basophils blood test is a diagnostic tool used to measure the number of basophils, a type of white blood cell, in a person's blood. Basophils are part of the immune system and play a role in allergic reactions and inflammation. Abnormal levels of basophils can be a sign of certain medical conditions, such as allergic reactions, inflammation, and some blood disorders. A healthcare provider may order a basophils 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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