Allergy Testing
Allergy testing may reveal the specific allergens to which an individual is sensitive. Skin testing is the most common method of allergy testing. This may include intradermal, scratch, patch, or other tests. Less commonly, the suspected allergen is dissolved and dropped onto the lower eyelid as a means of testing for allergies. This test should only be done by a physician, never the patient, since it can be harmful if done improperly. In some individuals who cannot undergo skin testing (as determined by the doctor), the RAST blood test may be helpful in determining specific allergen sensitivity.
Allergy testing can either show allergies that aren't actually causing symptoms, or miss allergies that do cause symptoms. The intradermal allergy test is more sensitive than the skin prick test but is more often positive in people who do not have symptoms to that allergen.
Even if a person has negative skin-prick, intradermal and blood tests for allergies, they may still have allergic rhinitis, from a local allergy in the nose. This is called local allergic rhinitis. Specialized testing is necessary to diagnose local allergic rhinitis.
Read more about this topic: Allergic Rhinitis
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... In some cases, patients or doctors come to request regular extensive allergy testing over a long period of time in hopes of getting new insight ... No evidence shows regular allergy testing results in identification of a problem or relief for people with chronic urticaria ... Regular allergy testing for people with chronic urticaria is not recommended ...
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