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DXA scan

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Introduction
A DEXA scan is a special type of X-ray that measures bone mineral density (BMD). DEXA stands for "dual energy X-ray absorptiometry". This type of scan is also often known as DXA, or "dual X-ray absorptiometry". It's also sometimes referred to as a bone density scan or a bone densitometry scan.
When a DEXA scan is used
A DEXA scan is used to measure bone density and assess the risk of bone fractures.
How a DEXA scan is performed
A DEXA scan is a quick and painless procedure that involves lying on your back on an X-ray table so that an area of your body can be scanned.