Allergy testing, which is accomplished by injecting tiny amounts of allergen into the skin and examining the injection site for a reaction, is an example of an in vitro test.

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Allergy testing is an example of an in vivo test because it is done in living organisms (humans or animals) and involves injecting allergens under the skin, then observing the resulting reaction. In vitro tests, on the other hand, are done in test tubes or other laboratory equipment, without involving living organisms.

Allergy Testing, Which Is Accomplished by Injecting Tiny Amounts of Allergen