Laboratory findings

See below

Laboratory Findings


Normal Result

Abnormality with Condition


Throat cultures

ASO titer (antistreptolysin O titer)

Negative culture <166 Todd units

Positive for group A beta-hemolytic streptococci

<250 Todd units for an inactive infection; 500-5000 Todd units for an active infection

Identifies causative organism in the acute phase of pharyngeal infection

Antibody to the streptolysin-O enzyme produced by group A beta-hemolytic streptococci; titers raise about 7 days after infection and gradually return to baseline after 12 mo

Other Tests: Complete blood count, C-reactive protein, erythrocyte sedimentation rate (ESR), chest x-ray, echocardiogram, chest computed tomography (CT) scan, chest magnetic resonance imaging (MRI)

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