Eosinophils typically constitute an average of 5% of white blood cells. The absolute eosinophil count, derived by multiplying the eosinophil percentage by the total white blood cell count, generally falls within the range of 30 to 350 cells per microliter. However, values up to 500 cells per microliter are widely considered to be within the normal range. An eosinophil count of 500 or more cells per microliter in the blood is indicative of eosinophilia, a condition characterized by elevated eosinophil levels. This elevation frequently points to an enhanced immune response and increased inflammation within the body, often associated with underlying issues like allergies, autoimmune diseases, or certain cancers. Conversely, eosinopenia, signifying low eosinophil levels, is diagnosed when the count drops below 30 cells per microliter. This reduction can be a consequence of conditions that lead to excessive cortisol production, such as Cushing's syndrome, or factors like significant alcohol consumption and intense stress.