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RAST stands for radioallergosorbent test. This is a blood test used to diagnose allergies. Your blood is drawn and a lab will analyze your blood sample for the level of antibodies that cause allergies.
Blood Tests. Blood tests measure the presence of IgE antibodies to specific foods. (IgE, short for âimmunoglobulin E,â is the antibody that triggers food allergy symptoms.) In the past, these tests were called âRASTsâ (which stands for radioallergosorbent tests) because they used radioactivity, but modern tests do not.