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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.
In cases of anaphylaxis, levels are expected to exceed 10 ng/mL and can increase greater than 100 ng/mL in anaphylaxis from hymenoptera stings or medications. Allergen-specific skin testing or radioallergosorbent (RAST) testing can be used to identify certain causes of immunologic IgE-mediated reactions to food, latex, stinging insects, and other environmental allergens.