DXA is the medical term for what is known as dual-energy X-ray bone densitometry, which accurately detects how much bone mass is in each unit area of a patient with osteoporosis, and can indicate whether or not the patient is osteoporotic. There is also a range between normal bone mass and osteoporosis, called osteopenia, and dual-energy X-ray bone densitometry is a very accurate, quantitative test. DXA Bone Density is to determine peak Bone Mineral Density (BMD) size, age and normal values at all ages. It should be used to determine the bone density of lumbar spine and hip.The value of DXA BMD varies according to gender. In the age group of 65 years, for every 1 standard deviation (SD) decrease in BMD values, the risk of hip fracture increased 2.94 times (2.02-4.27) in men and 2.88 times (2.31-3.59) in women. The gradient of risk for all types of fractures and osteoporotic fractures was lower than that for hip fractures, and the predictive value of BMD increased with age. In the age group of 65 years, for every 1 SD decrease in BMD, the risk of osteoporotic fracture increased 1.41 times in men (1.33 to 1.51) and 1.38 times in women (1.28 to 1.41). In conclusion, lower BMD values were more predictive of osteoporotic fracture, and DXA BMD had a similar effect on hip fracture.