Synonyms:

• ASO; ASLO; ASO Titer; Streptolysin O Antibodies

The Antistreptolysin O (ASO) Antibodies blood test is used to document exposure to streptococcal streptolysin O. A marked rise in titer or a persistently elevated titer indicates that a Streptococcus infection or poststreptococcal sequelae are present.