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Anti Streptolysin O (ASO) – Quantitative, Serum is a blood test used to detect and measure antibodies produced against streptolysin O toxin released by Streptococcus bacteria. This test helps in identifying recent or past streptococcal infections that may lead to complications such as rheumatic fever, post-streptococcal arthritis, and certain kidney conditions. The quantitative ASO test is useful in evaluating unexplained fever, joint pain, and inflammation following throat or skin infections, and supports doctors in diagnosis as well as treatment monitoring.