What test measures eosinophil count?

CBC with diff. The CBC with differential measures all five types of white blood cells, including the eosinophil. To be more accurate, have your doctor request a CBC with a manual differential.
WBC count inCBC+diff. Neutrophils are normally 45-74% in a count of wbc's while eosinophils are normally 0-7%. See your doctor for details.