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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.
Types of allergy testing. There are two basic types of allergy testing. The most common is a blood test that checks for antigen-induced antibodies in the dog's blood. There are two standard tests that are used to test the blood. The first is called a RAST test (radioallergosorbent).