Eosinophils are white blood cells involved in immune responses, particularly against parasites and allergens.

The AEC test provides the exact count of eosinophils in blood, usually as part of a complete blood count (CBC) with differential.

Clinical uses include:

Detecting allergic conditions (asthma, hay fever, eczema).

Identifying parasitic infections (helminths, protozoa).

Supporting diagnosis of hematological disorders (e.g., hypereosinophilic syndrome, certain leukemias).

Monitoring immune system activity and treatment response.

The test is performed using a blood sample via automated hematology analyzers.

Analyte: Eosinophils in blood.

Normal Range: ~50 – 500 cells/µL (varies slightly by lab).

Abnormal Findings:

Eosinophilia (↑ AEC): Suggests allergic disease, parasitic infection, autoimmune disorders, or hematological malignancies.

Eosinopenia (↓ AEC): May occur in acute infections, stress, or corticosteroid therapy.

Clinical Use:

Provides a precise measure of eosinophil levels.

Helps differentiate causes of abnormal total leukocyte count (TLC).

Guides further diagnostic evaluation and monitoring.