Bone density examination sites are selected according to gender and the site of symptoms, as follows: 1. If middle-aged and elderly women want to have a bone density examination to determine whether they have osteoporosis, they need to have a bone density measurement of the lumbar spine. The lumbar spine of middle-aged and elderly women is very sensitive to osteoporosis as a disease, and once female patients suffering from mild osteoporosis, examination in the lumbar spine can detect osteoporosis as a disease earlier than examination in other parts of the body. This can take early treatment measures to prevent aggravation of the disease, but also to prevent fractures and other conditions caused by osteoporosis. 2, if middle-aged and elderly men want to check bone density measurement, you can choose the femoral head, femoral neck, but also the lumbar spine, basically can be detected in the early stages of osteoporosis. 3, most patients suffering from osteoporosis for review, or patients with symptoms of limb pain, will This can more accurately determine whether the symptoms are caused by osteoporosis.