Hi Chris:my girl still not have 24 hours urine test.because we can't collect her urine all.we will do it when she is 3 years old.we now only rely on her bone age.she still eat 7mg/day.she express active.i don't dare to deduce her dosage,although i know this is not science.your Jack is very fortunely who has wonderful mother.good lucky to you.yong yan