What does eosinophilia indicate about a patient's eosinophil levels?

Eosinophilia refers to an elevated level of eosinophils, which are a type of white blood cell involved in the body's immune response, particularly in combating parasitic infections and allergic reactions. When a laboratory test shows eosinophilia, it indicates that the count of eosinophils in the blood is higher than the normal range, which typically signifies that the body is responding to certain conditions such as allergies, asthma, autoimmune diseases, drug reactions, or parasitic infections.

Thus, when determining the eosinophil levels in a patient that indicates eosinophilia, it is important to understand that an increase in eosinophils can serve as a significant marker for various health issues, guiding further investigation and treatment.