The DXA Bone Density Test

Osteoporosis is characterized by a loss of mineral and strength in the bones. Various conditions, including aging, may increase the risk of osteoporosis.

The DXA bone density test (Dual Energy X-ray Absorptiometry) measures the bone mineral density at various sites. It can help you and your physician in the diagnosis, treatment and monitoring of osteoporosis and other metabolic bone disorders.

Other bone measurements (for example, ultrasound performed on the heel) can also detect osteoporosis, but DXA provides the most useful information.

What happens during a bone density measurement?

The DXA test is painless. You lie on a table while the machine scans your spine, hip or other sites. The scan takes less than 10 minutes. A bone density measurement of your forearm may be necessary. For this scan, you sit in a chair while the machine scans your forearm. This takes about 5 minutes.

How does DXA work?

The DXA machine uses a small amount of X-ray to measure the mineral in the bones. The information DXA provides is different from regular X-rays, which show the shape and structure of bones. The amount of X-ray you are exposed to is very small, about the same as the radiation you might be exposed to during a cross-country plane trip.

When should I delay a bone density measurement?

You should not have a bone density measurement within seven days of having any of the following tests:

• Bone scan

• Angiogram

• CAT scan with contrast

• Myelogram

• Nuclear cardiology testing

How should I prepare for my DXA measurement?

• Wear clothing that is comfortable and easy to remove. You may be asked to change into a gown before the scan.

• On the day of your appointment, do not take calcium supplements before the scan.

• You will be asked to lie on a table on your back for 5 to 10 minutes.

How do I get a DXA bone density test?

The Clinical Research Centre provides FREE bone density tests for individuals who qualify. Call 604-263-3661 or Toll Free 1-866-226-6143 to see if you are eligible!