An Absolute Eosinophil Count (AEC) test is a blood test that measures the number of eosinophils, a type of white blood cell, in your body. It helps diagnose and monitor conditions like allergies, parasitic infections, and autoimmune diseases by identifying if eosinophil levels are too high or too low. The test involves a standard blood draw, and the results can help doctors determine the cause of unexplained symptoms or track treatment respon