ASO (Quantitative) Test Description

The ASO (Anti-Streptolysin O) quantitative test measures the exact concentration of anti-streptolysin O antibodies in the blood. These antibodies are produced in response to Streptolysin O, a toxin released by Group A Streptococcus bacteria. The test provides a numerical value that indicates the degree of immune response to a recent or past streptococcal infection.

Uses of the Test

• Diagnosing post-streptococcal complications: Helps confirm conditions like rheumatic fever or glomerulonephritis following a streptococcal infection.
• Monitoring disease progression: Evaluates changes in antibody levels over time to assess infection activity or the effectiveness of treatment.
• Differentiating recent infections: Higher antibody titers typically suggest a recent or active infection.

Interpretation of Results

• Normal ranges vary by lab but are often below 200 IU/mL in adults and 150 IU/mL in children.
• Elevated ASO titers suggest a recent or ongoing streptococcal infection.

Remedies for Elevated ASO Levels

• Antibiotics: Treat the underlying infection with penicillin, amoxicillin, or alternative antibiotics if allergic.
• Anti-inflammatory therapy: Use NSAIDs or corticosteroids for managing inflammation caused by complications like rheumatic fever.
• Prophylaxis: Long-term antibiotic prophylaxis may be necessary for recurrent infections or severe post-streptococcal complications.
• Supportive care: Rest, hydration, and management of symptoms such as fever, joint pain, or fatigue.

Regular follow-up and monitoring of ASO titers are essential, particularly in patients with a history of post-streptococcal complications. Early intervention reduces the risk of long-term complications.