Antistreptolysin O

Antistreptolysin O (ASO) is used for diagnosis and monitoring of human streptococcal infections.

Reference Ranges

Adults≤ 200 IU/mL
Children≤ 150 IU/mL
Each laboratory should check if the reference ranges are transferable to its own patient population and determine own reference ranges if necessary. For diagnostic purposes, the results should always be assessed with the patient’s medical history, clinical examinations and other findings.

Increased in

  1. Infection by streptococci (Arthritis)

Decreased in

  1. Poststreptococcal glomerulonephritis


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