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Definition of Test, allergy scratch

Test, allergy scratch: Test done on the skin to identify the allergy substance (the allergen) that is the trigger for an allergic reaction.

A small amount of the suspected allergy-provoking substance is placed on the skin. The skin is then gently scratched through the small drop with a special sterile needle.

If the skin reddens and, more importantly, if it swells, then the test is read as positive and allergy to that substance is considered probable.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=9139
Last Editorial Review: 6/14/2012

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