Ige blood test: To diagnose an allergy

To diagnose an allergy, you may need to have a blood test that measures immunoglobin (IgE), an antibody that helps the body fight off foreign bodies, such as bacteria and viruses. 1 An IgE blood test can determine levels of different IgE antibodies. If levels are too high, it indicates an allergy. What is checked in the IgE test? Your serum IgE levels are checked in an Immunoglobulin E blood test, which involves B cells, and the serum IgE test results will gauge whether there is an infection or an underlying condition that is causing an immune reaction, based on your blood test. Learn how a blood test can measure IgE levels, an antibody involved in allergic reactions and immune system disorders. Find out how IgE testing can help diagnose and monitor conditions like allergic rhinitis, asthma, and atopic dermatitis. The IgE test measures the amount of Immunoglobulin E (IgE) in the blood. IgE antibodies are produced by the immune system as a defense mechanism against allergens, such as pollen, dust, pet dander, certain foods, and insect stings.