An absolute eosinophil count is a blood test that measures the number of one type of white blood cells called eosinophils. Eosinophils become active when you have certain allergic diseases, infections, and other medical conditions.

Normal eosinophil count is less than 500 cells per microliter (cells/mcL).

Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your specific test results.