All of the following are common methods employed to perform allergy testing except:

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Injecting a small amount of allergen directly into the bloodstream is not a common method for allergy testing due to the high risk of causing a severe allergic reaction. Common methods include skin tests (such as scratch tests) and inhalation tests, or injecting allergens just below the skin (intradermal tests), but not directly into the bloodstream.

All of the Following Are Common Methods Employed to Perform