DXA, or dual-energy X-ray absorptiometry, is a widely used technique for measuring bone mineral density and body composition. It uses two different X-ray beams to differentiate between bone, muscle, and fat tissue in the body. DXA scans are commonly used in clinical settings to diagnose osteoporosis and assess risk for fractures, as well as in research studies to evaluate changes in body composition over time. Overall, DXA provides valuable information about bone health and overall body composition, which can help guide treatment decisions and interventions for various health conditions.