To the Editor: Bone densitometry by means of dual energy absorptiometry (DXA) has been the gold standard for estimating bone mineral density (BMD) for over 3 decades and is pivotal in the current management of osteoporosis. DXA technology relies on measuring the attenuation of two different x-ray energies that can be used to calculate BMD or, alternatively, soft tissue mass, including fat and lean tissue mass. Over the past few years, there has been increasing use of DXA for estimating fat and lean tissue in body composition. These parameters are widely used in research into diseases that affect body composition (such as HIV, obesity and eating disorders), and increasingly in related clinical settings. While using DXA in this way is beneficial in some patients, there is anecdotal evidence of growing inappropriate use or overuse of DXA body composition estimation in monitoring weight loss or exercise programs, often supplied by non-medical practitioners.
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