A patient is suspected of having an allergic reaction to certain laundry detergents. The nurse recognizes that which diagnostic test result would best confirm a hypersensitivity reaction?
1. Rh antigen with negative results
2. Eosinophils of 2% of the total WBC
3. Prick test with 3 mm erythema
4. Indirect Coombs' showing no agglutination
3
Rationale 1: Rh antigen results that are negative reflect the absence of the Rh factor in the blood. This result is not associated with hypersensitivity reaction.
Rationale 2: Eosinophils do increase with hypersensitivity reaction, but this result is within normal limits.
Rationale 3: Positive results from a prick test include wheal and flare of at least 3 mm.
Rationale 4: The indirect Coombs' test detects the presence of circulating antibodies against RBCs. This result is not associated with hypersensitivity reaction.
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