Hi, my son is 10 years and 2 months old, height 152cm and weighs 56kg. I have been noticing his rapid development since birth. He has always been beyond the 97th percentile in the growth chart. Recent pead visit suggested me to do hormone growth and igf blood test. All shows within normal range. However, his bone age of left hand & wrist indicated that he is 13years and 6 months old. Is it alarming? What does it indicate?