A DEXA scan is a specialised, low-dose X-ray test that measures bone mineral density. It is often used to assess osteoporosis and help estimate the risk of fractures. It does not diagnose every cause of bone pain and is different from a standard X-ray, which is mainly used to look at bone structure and injury.
At PrivateScans, our pre-scan GP consultation helps review your bone-health concerns and whether a DEXA scan is appropriate. Appointments can usually be arranged within 1–3 days, with results provided within 3 days of your scan.
What does a DEXA scan measure?
DEXA stands for dual-energy X-ray absorptiometry. It uses two low-dose X-ray beams to estimate bone mineral density, commonly at the hip and spine. The result helps doctors assess whether bone density is lower than expected and consider fracture risk alongside other information.
The scan is quick and non-invasive. It uses a much lower radiation dose than many other X-ray examinations, although the team should still know if you are pregnant or might be pregnant.
Who might be offered a bone density scan?
a doctor may consider DEXA for people with risk factors for osteoporosis, including certain fractures after minor injury, some long-term medicines or health conditions, early menopause or other factors affecting bone health. Age alone does not determine whether a scan is appropriate.
The result is usually considered alongside medical history, family history, medicines, previous fractures and other risk factors. A DEXA scan is not a substitute for clinical assessment or an automatic screening test for everyone.
What happens during the appointment?
You lie on a padded table while the scanner passes over the areas being measured. The examination is generally painless and you do not need to go inside a tunnel. You may be asked to keep still and change position slightly so the hip or spine can be assessed.
Preparation is usually straightforward, but follow the instructions from the provider. Tell the team about recent contrast examinations or nuclear medicine tests, if relevant, and pregnancy or possible pregnancy.
Understanding the result
The report may include a T-score, which compares bone density with that of a healthy young adult reference population, and sometimes a Z-score, which compares with people of a similar age and sex. The meaning depends on age and clinical context, and interpretation differs for younger adults and children.
A result should be discussed with a doctor who can explain whether it suggests low bone density, osteoporosis or a need for further risk assessment. Treatment decisions can include lifestyle advice, falls prevention, medication or evaluation for an underlying cause.
What can you do for bone health?
General measures can include adequate calcium and vitamin D, weight-bearing activity suited to your abilities, reducing smoking and excessive alcohol, and reviewing medicines that may affect bone health with a doctor. The right approach depends on your overall health and fracture risk.
Do not start high-dose supplements or stop prescribed medication solely because of an online article or a scan result. Ask a healthcare professional for advice tailored to your circumstances.
DEXA compared with other scans
A standard X-ray may show a fracture or advanced changes, but it is not as sensitive as DEXA for measuring bone mineral density. MRI and CT have different roles and are not interchangeable with a DEXA bone-density assessment. The test should be chosen for the question being asked.
Understanding T-scores and Z-scores
A DEXA scan measures bone mineral density, usually at the hip and lower spine. In adults, the report may include a T-score, which compares bone density with a reference value for a healthy young adult, and sometimes a Z-score, which compares the result with people of a similar age and sex. These scores help doctors interpret the measurement, but they are not a complete assessment of fracture risk on their own.
For many postmenopausal women and men aged 50 or over, a T-score of -2.5 or lower at an appropriate site is one criterion used to diagnose osteoporosis. Interpretation differs for younger adults and depends on clinical context. a doctor may also consider previous fractures, age, family history, medicines and a fracture-risk tool when deciding whether treatment is needed.
Who may benefit from bone density assessment
DEXA may be considered for people with risk factors for fragile bones, such as a previous low-trauma fracture, certain long-term steroid treatments, conditions associated with bone loss, early menopause or other relevant clinical factors. It is not necessarily needed as a general screening test for every healthy adult. The decision depends on whether the result will help estimate fracture risk or guide management.
Tell your doctor if you have recently had a contrast examination or nuclear medicine test, as timing can sometimes affect scheduling. Also mention possible pregnancy. Follow the imaging provider’s instructions about clothing and metal fasteners; preparation is usually straightforward, but individual instructions take priority.
What happens after a DEXA scan
The scan itself is usually painless and uses a very low dose of X-rays. A report gives bone-density measurements, which are considered alongside age, medical history and fracture risk. Depending on the findings, Our doctor may recommend lifestyle measures, checking vitamin D or calcium intake, reviewing medicines, assessing fall risk, or considering medication to reduce fracture risk.
Do not start or stop supplements or prescribed treatment solely on the basis of an isolated score. Ask your doctor who requested the test to explain what the result means for you and whether follow-up or repeat measurement is appropriate. A DEXA result is most useful when it leads to a plan that addresses your individual risk.
Sources and further reading
These NHS resources provide further information. They do not replace individual clinical advice.
This article is for general information only and does not replace an individual assessment or advice from a qualified healthcare professional. Scan suitability and preparation depend on your circumstances and the specific examination. If you are worried about symptoms, speak to a healthcare professional. Seek urgent help for emergency symptoms.
Frequently asked questions
Answers to common questions about your scan, how to prepare and what happens next.
Does a DEXA scan hurt?
No. It is usually painless. You lie on a table while the scanner measures bone density.
Does DEXA use radiation?
Yes, but it uses a very low dose of X-rays. Tell the provider if you are pregnant or might be pregnant.
Can a DEXA scan diagnose osteoporosis by itself?
It provides important bone-density information, but doctors consider the result alongside age, medical history, fractures and other risk factors.
Do I need a referral for a DEXA scan?
Requirements vary by provider and clinical pathway. Our doctor can help determine whether the test is appropriate and how it should be arranged.
Ready to arrange your scan?
At PrivateScans, we make arranging your scan straightforward. Appointments can usually be arranged within 1–3 days, and your results are provided within 3 days of your scan. When you’re ready, book online. If you have questions before booking, our team is here to help.