What is DEXA Scanning?

A DEXA scan is a painless test that measures the density of bones. DEXA 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. DEXA 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, and to monitor the relative amounts of body fat and muscle in your body.

A DEXA 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. DEXA 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.

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 will have assessed you as being at risk from osteoporosis.

Are There any Reasons I Cannot Have a DEXA 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 DEXA 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.