What is an eosinophil?
An eosinophil is a type of white blood cell, which is produced from the bone marrow. It has many granules in it which when released can fight infections. The eosinophil count in the blood is normally 0.4 x 10 9/L (0.1 – 0.6) and results from a balance between production of eosinophils from the bone marrow and escape of eosinophils into the blood circulation.