Which injection method is typically used for allergy tests?

The injection method most commonly used for allergy tests is intradermal. This technique involves injecting a small amount of allergen directly into the skin, which allows for a localized reaction to occur. The purpose of this method is to evaluate the immune response at the site of injection, making it possible to observe how the skin reacts to specific allergens.

Intradermal injections are particularly advantageous for allergy testing because they involve depositing allergens just beneath the outer layer of the skin, where immune responses can be readily assessed. This method can elicit a response that often helps in diagnosing allergies, as it provides an immediate indication of the skin's sensitivity to various substances.

While other injection methods like subcutaneous, intramuscular, and intravenous have specific applications, they are not suitable for allergy testing. Subcutaneous injections deposit the substance further into the tissue, whereas intramuscular injections introduce the substance into a muscle, and intravenous injections deliver the substance directly into the bloodstream. None of these methods can facilitate the localized skin response that is essential for accurately determining allergies.