I am still not clear at what age the CAH child should have the bone growth x-rays (some say age 3 years old and some 1 year - confusing), but I found this phone number and address: Bone Measurement Institute A Non-profit subsidiary of Merck. P.O. Box 833, Spring House, PA 19477-0833 Phone: 1-800-742-3317 Fax: 1-800-742-3381 The BMI alerts physicians to the need to make bone measurement part of their standard practice to help