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Bone mineral density (BMD) is a measure of the amount of minerals, such as calcium and phosphorus, contained in a segment of bone tissue. It is an important indicator of bone strength and is used to diagnose osteoporosis, a condition that causes bones to become weak and brittle, increasing the risk of fractures.
BMD testing is usually performed using a dual-energy X-ray absorptiometry (DXA) machine, which is a specialized type of X-ray that measures bone density in the hip, spine, and other areas of the body. The DXA scan provides a T-score, which compares a person's BMD to that of a healthy young adult of the same sex. A T-score of -1.0 or higher is considered normal, while a T-score between -1.0 and -2.5 indicates low bone mass (osteopenia), and a T-score of -2.5 or lower indicates osteoporosis.
BMD testing is recommended for certain individuals, including postmenopausal women, men over the age of 70, and individuals with a history of fragility fractures or other risk factors for osteoporosis. Lifestyle factors such as diet, exercise, and smoking can also affect BMD and bone health.
Treatment for osteoporosis may include medications to improve bone density, as well as lifestyle modifications such as weight-bearing exercise and adequate calcium and vitamin D intake. Regular BMD testing may also be recommended to monitor bone density and assess the effectiveness of treatment.