EOSINOPHIL COUNT - A measurement (cells per microliter) of the number of eosinophils in a blood specimen. This measurement, also known as the absolute eosinophil count, is useful in the evaluation of autoimmune disease, allergies, eczema, leukemia, asthma, and hay fever. Normal absolute eosinophil counts are less than 350 cells/mcl (microliter).