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Anti-Streptolysin O (ASO)


This assay identifies immune complexes that are formed in solution due to antigen-antibody interaction. The rate of decrease in light intensity transmitted (increase in absorbance) is measured by a turbidimeter.

Test Utility

This test looks for antibodies that the body produces against streptolysin O, a toxic enzyme that is produced when the patient has an infection with group A Streptococcus bacteria.

Specimen Collection and Preparation

Serum in the following tubes: Serum separator tube (gold or tiger top)

Specimen Storage and Stability

Store serum at the following temperatures:

  • Room Temperature (20-26°C): Not indicated

  • Refrigerated (2°C to 8°C): Several weeks

  • Frozen (< 20°C or lower): 6 months

Specimen Rejection

  • Insufficient sample volume

  • Sample not stored at proper temperature

  • Frozen whole blood

  • Severely hemolyzed samples

  • Severely lipemic specimens

  • Specimen labeled incorrectly or not labeled

Reference Pages


Monday – Sunday, 16 hours a day  

Result available within 24 hours of receipt in laboratory  

NOTE: Specimens are refrigerated (2-8°) for 7 days before disposal STAT results available within 2 hours of receipt in the laboratory


Vibra Health Laboratory  

1307- A, Allen Dr Troy, MI 48083 

(248) 846-0663

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