Eosinophils are white blood cells that play a role in the body’s immune response, especially against allergies and parasitic infections.

The AEC test provides the exact number of eosinophils per microliter of blood, rather than just a percentage.

It is often ordered when patients show symptoms like persistent cough, wheezing, skin rashes, or unexplained fever.

Clinical uses include:

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

Identifying parasitic infections (roundworm, hookworm, filariasis).

Monitoring blood disorders such as hypereosinophilic syndrome or certain leukemias.

Both low counts and high counts (eosinophilia) can provide important diagnostic clues.

Analyte: Eosinophils (a type of white blood cell).

Normal Range: Typically 30–350 eosinophils/µL of blood in adults (ranges may vary by lab).

High AEC (Eosinophilia): May suggest allergies, asthma, parasitic infections, autoimmune disease, or certain cancers.

Low AEC: Usually not clinically significant but may occur in stress or steroid therapy.

Clinical Use:

Helps diagnose allergic and parasitic conditions.

Monitors treatment response in eosinophilia-related disorders.

Supports evaluation of unexplained fevers or respiratory issues.