Absolute Eosinophil Count (AEC), Whole Blood
What it is
The Absolute Eosinophil Count (AEC) test measures the number of eosinophils in the blood. Eosinophils are a type of white blood cell that play an important role in the body’s immune system, especially in allergic reactions and defense against parasitic infections.
Uses
This test helps in diagnosing allergic conditions such as asthma, hay fever, and eczema. It is also used to detect parasitic infections and to monitor eosinophilic disorders and autoimmune diseases.
Symptoms That May Lead to the Test
Doctors may order this test if a patient has symptoms like persistent cough or wheezing, skin rashes, itching, asthma attacks, nasal allergies, or signs of a suspected parasitic infection.
Abnormal Results
High AEC: Indicates conditions such as allergies, asthma, parasitic infections, certain autoimmune diseases, and some types of cancers like Hodgkin’s lymphoma or leukemia.
Low AEC: Usually not clinically significant, as very low eosinophil counts rarely cause health issues.
Risks
The Absolute Eosinophil Count test is a routine blood test with minimal risks. Some patients may experience mild pain, bruising, or slight bleeding at the puncture site, and rarely dizziness or infection.


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