A patient is suspected of having a hypersensitivity reaction. Which laboratory test result supports this suspicion?
1. patch test with a 1-inch area of erythema
2. eosinophils 2% of the total WBC
3. Coombs indirect showing no agglutination
4. elevated hematocrit level
Correct Answer: 1
A patch test assesses a one-inch area impregnated with the allergen and is applied for 48 hours. Absence of a response indicates a negative result. Positive responses are graded from mild erythema in the exposed area to severe papules, vesicles, or ulcerations. The Coombs' indirect test checks the recipient's and donor's blood for antibodies before a blood transfusion. The normal range of the eosinophil count is 1%–4%. There is not enough information about the elevated hematocrit level.
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