A patient has been diagnosed with contact dermatitis, a type IV allergic reaction. At this point no offending agent has been identified. What test might the physician use to aid in identifying what caused the reaction in the patient?
A) Scratch
B) Skin
C) TRUE
D) RAST
Ans: C
Feedback: Patch tests on the skin with suspected offending agents may clarify the diagnosis. The patch test most commonly used is the thin-layer rapid use epicutaneous (TRUE) test. Skin testing is how a RAST test is performed. The Scratch test is performed before a RAST to aid in avoiding a systemic reaction to the allergen.
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