Adult and preschool age child: <100 IU/mL
Child (school age) : <200 IU/mL
. Red-top tube
■ Streptolysin is an enzyme secreted by beta-hemolytic streptococci.
It causes an antibody response that begins to rise 1
week after streptococcal infection and peaks in 2–3 weeks.
■ High serum ASO levels are seen with acute rheumatic fever,
poststreptococcal glomerulonephritis, and collagen
diseases.
