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Order Code CH118
Turnaround Time 72 hours
Test Includes

Anti-Streptolysin O Antibody

Specimen Requirements
Specimen Source
Transport Container
(Specimen Container)

SST (Tiger Top)

Preferred Specimens
Minimum Volume (uL)
0.5 mL
Collection Instructions
(Transport Temperature)
Room temperature
Specimen Stability
Temperature Period
Room temperature 72 hours
Refrigerated 5 days
Frozen 30 days
Test Details
Clinical Significance

Anti-Streptolysin O Antibody (ASO) – This test is a sensitive test for recent streptococcal infection. A rise in ASO begins about one week after infection and peaks two to four weeks later. ASO levels do not rise with cutaneous infections. In the absence of complications or reinfection, the ASO level will fall to preinfection levels within 6 to 12 months. Over 80% of patients with acute rheumatic fever and 95% of patients with acute glomerulonephritis due to streptococci have elevated levels of ASO

Reference Ranges

<100 IU/mL (<5 Years) <250 IU/mL (5-20 Years) <200 IU/mL (≥21 Years)