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Definition of Scratch test for allergy

Scratch test for allergy: A test in which a small drop of the suspected allergy-provoking substance (allergen) is placed on the skin and the skin is then gently scratched through the drop with a sterile needle. If the skin reddens and, more importantly, if it swells, the test is read as positive, and allergy to that substance is considered probable.

QUESTION

Allergies can best be described as: See Answer
Reviewed on 12/27/2018
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