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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.
Binding of IgE specific to that allergen is detected by the use of an enzyme linked anti-human IgE antibody in a colorimetric reaction. Results of RAST testing show a very good corelation between the presence of IgE antibody in serum and positive skin and provocation tests, as well as symptoms of allergy.here is a good correlation between the results of serum tests for IgE antibodies, and positive skin and provocation tests, as well as symptoms of allergy. Positive in-vitro results to a specific allergen demonstrate IgE sensitization but are not proof that the allergen is the cause of clinical symptoms.