11 Foods That Soothe a Sore Throat Many fruits, vegetables, and herbs are capable of saving the day with their antioxidant-rich powers and can sometimes help you avoid that trip to the doctor. iStock/Thinkstock
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.
These chemicals are what cause allergy symptoms. Immunoglobulin E (IgE) is an antibody that's strongly linked to the body's allergy response. Allergy blood tests usually screen for at least 10 of the most common allergy triggers, including dust, pet dander, trees, grasses, weeds, and molds related to where you live. They are also particularly helpful in diagnosing food allergies. Allergy blood tests may be referred to as immunoassay tests and include: 1  Enzyme-linked immunosorbent assay (ELISA, or EIA). 2  Radioallergosorbent test (RAST).