DXA
What is a DXA scan?
A DXA scan is a painless test that measures the density of bones. DXA stands for dual energy X-Ray absorptiometry. Generally, the denser your bones are the stronger they are, and the less likely they are to break.DXA scans help find out whether you have osteoporosis or are at risk of developing it. They can also be used to detect other bone disorders and conditions.
A DXA scan is a fast and accurate test, and is preferred over a normal X-Ray for detecting bone density because it is more sensitive. For example, normal X-Rays can only detect osteoporosis (weakened bones) when around one-third of the bone mass has already gone.
DXA scans can measure the calcium content in your bones; this can’t be measured in an ordinary X-Ray.
For further information, please visit the National Osteoporosis website at www.nos.org.uk and select ‘About Osteoporosis’ from the Main Menu.
About your DXA appointment
Who should be scanned?
Bone density assessment should ideally take place in those at risk of osteoporosis to identify early bone loss, take action to improve this and prevent fractures.
Reasons for scan
Your GP may have assessed you as being at risk from osteoporosis or you may feel that you are at risk and wish to refer yourself for a scan.
Are there any reasons I cannot have a DXA scan?
Patients with the following characteristics will be unable to have a scan:
• Recent contrast X-Ray e.g. Barium
• Severe arthritic or fracture deformity of the spine or femur
• Radio-opaque implants such as an artificial hip
• A patient’s inability to maintain correct position and/or remain motionless for the duration of the measurement.
If you are at all concerned then please contact your GP.
Are there any side effects?
A DXA scan involves a low dose of X-Rays (less than a normal X-Ray) being passed across the body. X-Rays are a form of radiation.
Everybody receives a small amount of radiation from the environment every day. The radiation received from your scan is very small, and would be less to the amount you would be exposed to on a transatlantic flight. However, if you receive many doses of radiation, the effect can build up and be harmful. Simply put, the less you receive, the better.
If you are, or suspect that you may be pregnant, please tell the radiographer before the scan is carried out.
All the information you give will be treated with the strictest confidence.
Before your appointment
No preparation is required prior to your examination.
If you require assistance with language interpretation or would wish to be escorted by a friend, relative or carer, please advise the clinic so that the staff are ready for you.
When you arrive
On arrival one of our staff will explain the procedure to you and answer any further questions you may have.
The examination
Depending on which part of your body is being scanned, you may be able to remain fully dressed, in clothes without metal fastenings. It is a painless procedure and you can go straight home afterwards.
How long will it take?
The length of time taken depends on the type of examination. Usually the procedure will take between ten and twenty minutes.
