Allergy tests are used to determine the specific substances that cause an allergic reaction in an individual. They may also be used to determine if a group of symptoms is a true allergic reaction, which involves antibodies and histamine release. Some food intolerances, in which there is an inability to digest a food because of lack of appropriate enzymes, mimic allergies. Some drugs, such as aspirin, can cause allergy-like symptoms without the formation of antibodies or the release of histamine.
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