An AEC (Absolute Eosinophil Count) test is a blood test that measures the number of eosinophils in the blood. Eosinophils are a type of white blood cell that helps fight infections and diseases in the body. A high eosinophil cell count in the AEC test result indicates a hidden or known infection that the immune system is trying to fight off. The test is used to detect the hidden or known allergic reaction to any medication, parasitic infection, disease, or any other medical condition. The test is recommended for diagnosis of certain diseases such as parasitic infections, early stages of Cushing’s disease, or Acute Hypereosinophilic Syndrome. The test is performed by taking a sample of blood from the arm, and the area from where the blood is drawn is cleaned with a swab of antiseptic solution before the needle is inserted into the vein. The test is usually recommended if you have symptoms like cold, cough, respiratory congestion, sore throat, asthma, itchy eyes, abdominal pain, skin allergy.