Sorry Michelle your correct I didn’t answer the question and I should have said this is what our Endo recommended for a 17 year old.  Our daughter didn’t have a bone scan until she was 17 but has broken two bones (arm on the Monkey Bars when she was about 4 years old and her foot when she was 14).  The spine doctor says she has deterioration of her spine but a bone scan of her wrist shows normal bone density.