antistreptolysin O assay
antistreptolysin O assay
ASO test Lab medicine A serologic test that monitors group A β-hemolytic streptococcal infection, ie 'strep throat'–90% positive, which may progress to acute streptococcal glomerulonephritis–±25% are ASO positive, scarlet fever, and rheumatic fever, and thus used to monitor response to therapy. See Strep throat.