Arms or back: In the very young their upper back would be used. In older children and adults, their arms. Never on the stomach.
Answered 7/3/2012
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On the back: We perform almost all intracutaneous testing on the back. Intracutaneous means the allergen test materials are placed on the skin followed by a point or set of points that makes a minimal puncture of the skin. We save the arms for intradermal tests. These are a select follow-up set of allergens injected into the outer layer of the skin using a fine needle. They're more sensitive but less specific.
Answered 12/9/2013
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