A Diagnosis of Rheumatic Fever Is Being Ruled Out for a Child

Multiple Choice

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?

A) Erythrocyte sedimentation rate
B) Throat culture
C) C-reactive protein
D) Antistreptolysin-O (ASO) titer