Bone age is generally determined by the doctor through the calculation after taking X-ray film, X-ray filming is generally based on the region, the hospital level price will vary, usually in the $100 or so, the specific cost of bone age also need to consult with the doctor in the hospital to determine. Doctors usually ask patients to take X-rays of the left wrist to determine bone age by looking at the metacarpal phalanges, carpal bones, and the ossification center of the lower end of the radius and ulna bones in the left hand. Bone age can not only determine the biological age of a child; it can also help to understand the growth and development of a child; it can also be used to predict a child’s height in adulthood; and it can also be used to help further diagnose some endocrine diseases, such as hyperthyroidism, hypothyroidism, and so on. Overall, the cost of measuring bone age is not high, but it is very useful, so if you need to measure bone age, you should follow your doctor’s instructions.