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Antistreptolysin O titre

Antistreptolysin O titre (AS(L)O titre or AS(L)OT) - titre of (serum) antistreptolysin O antibodies; a blood test used to assist in the diagnosis of a streptococcal infection or indicate a past exposure to streptococci.

Additional recommended knowledge

The ASOT helps direct the antimicrobial treatment and is used to assist in the diagnosis of scarlet fever, rheumatic fever and post infectious glomerulonephritis.

A positive test usually is >200 units/mL,[1] but normal ranges vary from laboratory to laboratory and by age.[2]

The false negatives rate is 20-30%.[1] If a false negative is suspected then an anti-DNase B titre should be sought. False positives can result from liver disease and tuberculosis.[1]


  1. ^ a b c Antistreptococcal antibody titres. gpnotebook. URL: Accessed on: March 31, 2007.
  2. ^ Danchin M, Carlin J, Devenish W, Nolan T, Carapetis J (2005). "New normal ranges of antistreptolysin O and antideoxyribonuclease B titres for Australian children". J Paediatr Child Health 41 (11): 583-6. PMID 16398843.

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Antistreptolysin_O_titre". A list of authors is available in Wikipedia.
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