What is the normal count of aso titre for a 13 yr girl.?

Varies. Kids not suspected of gabhs strep in the 5-10 year range, had 48% had titers below 100 6.8% had titers of 100 10.6% between 101-125 7.6% between 126-156, 22.1% between 157-195 and 4.5% in 196-244.