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Home Tests Streptolysin-O Abs - Titer (ASO)
Streptolysin-O Abs - Titer (ASO)
The ASO titer test measures antibodies produced by your body in response to a toxin known as streptolysin O. Streptolysin O is a toxin produced by group A Streptococcus (GAS) bacteria. Your body makes the antistreptolysin O antibodies when you have a strep infection caused by GAS bacteria.