Bone density in patients suspected of having osteoporosis can be examined in the following ways: 1. In most cases, the patient can be examined using dual-energy X-ray absorptiometry. This test not only determines whether the patient has osteoporosis, but also assesses the severity of the osteoporosis. In addition, it should be pointed out that for such patients, after such examination, a series of blood-related tests and clinical physical examination are also required to make a comprehensive judgment on such patients.2. For some people with high risk factors for osteoporosis, ultrasonography can be used to carry out a census of them, in order to preliminarily determine whether they have such a disease or not.3. For some people who are at high risk for osteoporosis due to trauma or physical examination, ultrasonography can be used to carry out a census of them, in order to preliminarily determine whether they have such a disease or not. Due to trauma or physical examination, patients who have had a certain X-ray examination can initially determine whether they have osteoporosis through some indirect signs, such as observing the condition of bone trabeculae to make a general judgment. If the doctor finds that the patient has a tendency for such diseases, he will arrange for the patient to undergo the next step of more precise examination.