Elizabeth Otero, M.D.
What are allergy blood tests (RAST tests)?

This involves testing for allergies through drawing blood. Blood tests are not done as often as skin tests, but they can be useful in some cases. A sample of your blood is sent to a lab for testing. The test measures the amount of IgE antibody in the blood. The body makes this type of antibody when trying to fight off allergy-causing substances as well as parasites. The test results show whether you are making antibodies to certain allergens and thus whether you are allergic to those allergens. These tests are done for airborne as well as food allergens.




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