What does RAST testing evaluate in terms of allergies?

RAST testing, or RadioAllergoSorbent Test, is a blood test specifically designed to evaluate the presence of specific IgE antibodies in the bloodstream. These antibodies are produced by the immune system in response to exposure to various allergens. When a person is allergic to a substance, such as pollen, pet dander, or certain foods, their body produces these antibodies as part of the immune response. The RAST test measures the levels of these IgE antibodies, helping to identify which allergens may be triggering an allergic reaction in the patient.

This testing method is particularly useful because it can be conducted without the need for skin exposure to allergens, which is beneficial for individuals who may have severe allergic reactions. In contrast, skin testing methods would directly expose the patient to allergens, which carries a risk of allergic responses.

Other methods mentioned, like audiometric responses, skin reactions, or auditory nerve function, are not related to the evaluation of allergic responses, focusing instead on different physiological or sensory responses.