A diagnosis of rheumatic fever is being ruled out for a child. The parents cannot remember the child having a recent streptococcal infection. Which lab test would confirm a recent streptococcal infection?
1. Erythrocyte sedimentation rate
2. Throat culture
3. C-reactive protein
4. Antistreptolysin-O (ASO) titer
4
Rationale 1: An erythrocyte sedimentation rate and a C-reactive protein can indicate inflammation.
Rationale 2: A culture can indicate a current streptococcal infection.
Rationale 3: An erythrocyte sedimentation rate and a C-reactive protein can indicate inflammation.
Rationale 4: The lab test for antistreptococcal antibodies is an antistreptolysin-O (ASO) titer.
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