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Allergy Relief / Allergy Test / Allergies: Blood Testing for Allergies
Allergies: Blood Testing for Allergies
Blood tests are sometimes performed to find out what triggers an allergic reaction and are often used if a patient has a skin condition or is taking medications, such as antihistamines. Such medications can interfere with an allergy skin test, which is a common test used to identify allergy triggers, but in general do not interfere with allergy blood tests.
The radioallergosorbent test (RAST) and the enzyme-linked immunosorbent assay (ELISA) test are two types of blood analyses that can be used to diagnose allergies. In both, a small amount of blood is taken from the allergy sufferer and analyzed for IgE antibodies (allergic antibodies) to specific antigens. High levels of these antibodies in the blood indicate an allergic reaction.
These blood tests may not be as effective as skin testing and tend to be more expensive, but can be useful in some situations.
From http://www.webmd.com/allergies/guide/blood-test
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DISCLAIMER: The information contained in this site is for educational purposes only, and should not be used as a substitute for personal care by a licensed physician. Please see your physician for diagnosis and treatment of any concerning symptoms or medical condition.
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