I recently had a test I want more information about. It was called an Eosinophile count. The eosinophile is a type of red blood cell found in the blood.
Eosinophiles carry histamines, which are the bodies natural defense against allergens.
During an allergic reaction, the body floods the system with eosinophiles, which are intended to deliver the histamines to the body. By counting the number of Eosinophiles in the blood, a doctor can determine if reactions have taken place. Since the normal incidence of eocinophils is very low in the blood stream, an elevation of these cells will be clinically significant as a diagnostic tool.