The ASO (Anti-Streptolysin O) Titre test measures the level of antibodies against streptolysin O produced by Group A Streptococcus bacteria. It aids in diagnosing recent streptococcal infections, particularly those associated with rheumatic fever. Elevated titers suggest recent infection, while normal titers indicate absence of recent streptococcal infection.

Risk assessment for the ASO Titre test involves considering potential false-positive or false-negative results, understanding the variability of titers with age and other factors, and interpreting results in conjunction with clinical symptoms and other diagnostic tests for accurate diagnosis of streptococcal infections, especially in cases of suspected rheumatic fever.

The ASO Titre test typically reports results quantitatively in Todd units per milliliter (Todd IU/mL). Reference ranges vary by laboratory but commonly include values below 200 Todd IU/mL as normal and values above indicating elevated titers suggestive of recent streptococcal infection. Interpretation should consider age-specific cutoffs and clinical context.

Interpretation of the ASO Titre test involves assessing the level of antibodies against streptolysin O. Elevated titers suggest recent streptococcal infection, while normal titers indicate absence of recent infection. Clinical correlation with symptoms and other diagnostic tests is essential for accurate interpretation.