Eosinophilia (e-o-sin-o-FILL-e-uh) is a higher than normal level of eosinophils. Eosinophils are a type of disease-fighting white blood cell, indicating a parasitic infection, an allergic reaction or cancer. There are blood eosinophilia and tissue eosinophilia. Tissue eosinophilia may be found in samples taken during an exploratory procedure or in samples of
certain fluids, such as mucus released from nasal tissues. If you have tissue eosinophilia, the level of eosinophils in your bloodstream is likely normal. Blood eosinophilia may be detected with a blood test, usually as part of a complete blood count. More than 500 eosinophils per microliter of blood is generally considered eosinophilia in adults. More than 1,500 eosinophils per microliter of blood that lasts for several months is called hypereosinophilia. This reviewed the correlation between high eosinophila and helminthiasis.