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DEXA (DXA) scans are used to measure bone density and assess the risk of bone fractures.
They're often used to help diagnose bone-related conditions, such as osteoporosis, or assess the risk of developing them.
Total body DEXA scans can also be used to measure body composition (the amount of bone, fat and muscle in the body). This type of scan is routinely used in children, but is still a research application in adults.
Unlike ordinary X-ray images, DEXA scans can measure tiny reductions in bone mineral density. This makes it possible to diagnose osteoporosis in its early stages, before fractures occur.
Doctors use the results of DEXA scans to help them decide whether treatment for low bone mineral density is needed.
This may include making lifestyle changes to help improve your bone health, such as:
A DEXA scan may be recommended if you have an increased risk of developing a bone condition such as osteoporosis. Your risk is increased if you:
A DEXA scan isn't the only way of measuring bone strength or fragility. Other risk factors need to be taken into consideration, such as family history and medication use, to determine who's at risk of developing bone fractures.
All of the risk factors need to be considered before a DEXA scan is recommended and before any treatment is started.
Some people need a DEXA scan to confirm that their risk of developing bone fractures is high enough to need treatment. For others, particularly elderly people over 75 years old, the risk of fracture may be so high that there's no need for them to have a DEXA scan before treatment is prescribed.
Interpreting the results of a DEXA scan can sometimes be difficult. For example, it may not be easy to interpret the results of a scan of the spine when someone has a degenerative condition, such as osteoarthritis of the spine (spondylosis). Sometimes, spinal abnormalities or a previous spinal fracture can give a false result.
A DEXA scan won't show whether low bone mineral density is due to osteoporosis (too little bone) or osteomalacia (too little calcium in bone, usually due to a lack of vitamin D).