Antistreptolysin O Antibody



Streptozyme, ASO.


To assist in the diagnosis of group A streptococcal infection.

Patient Preparation

There are no food, fluid, activity, or medication restrictions unless by medical direction.

Normal Findings

(Method: Immunoturbidimetric) Adult/older adult: Less than 330 international units/mL; 17 yr and younger: Less than 150 international units/mL. Values will vary between laboratories and methods.

AgeConventional Units
Newborn–1 yrEqual to or less than 200 international units/mL
2–12 yrEqual to or less than 250 international units/mL
13 yr–adultEqual to or less than 330 international units/mL

Critical Findings and Potential Interventions


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