The nurse is assisting with a skin test for a client suspected of having allergies to animals. Which of the following is a sign of a positive reaction?
A) Bruising
B) Red wheal
C) Flat macule
D) Bleeding
B
Feedback:
Several antigens are tested at one time, with each antigen injected intradermally or applied to a small scratch on the skin (epicutaneous method). These areas are then labeled or otherwise identified. After 20 minutes, the provider reads the skin tests in much the same way as in a tuberculin test. Erythema (redness) and, most commonly, an induration (a lump, wheal, or edema) indicates a positive skin test.
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