ANTI STREPTOLYSIN – O (ASO) TITRE

An antistreptolysin O titer (ASO) is a blood test used to determine if you’ve had a recent infection caused by group A streptococcus bacteria. It’s not used to diagnose a current strep infection, such as strep throat. Instead, this test is mainly used if you have symptoms that your doctor thinks may have been caused by a previous strep infection that went untreated.