Everything you need to know about a DXA scan
A bone density test, also known as a DXA (formerly DEXA) scan, stands for Dual Energy X-Ray Absorptiometry and is the most widely used test to measure bone mineral density. The measurement reflects the fact that the denser the bone, the less X-rays pass through. Usually the more dense your bone, the stronger it is, and the less likely it is to fracture.
If you’ve ever had an X-ray, the process is very similar.
A DXA machine uses low-energy X-rays and sends two different sources (thus the ‘D’ for “dual” in the name) through the bone in question. The two different X-ray sources are used to double the accuracy in measuring your bone density. So, your bone blocks some of the X-rays. And the more dense your bone is, the less X-rays pass through to the detector.
The amount of X-rays coming through the bone from each of the two X-rays is sent to a computer, which calculates an average score for the density of your bone.
A DXA scan is more accurate than regular x-rays or CAT scans and requires less radiation exposure. See more about radiation and DXA scans below.
The only truly accurate way to check your bone density is with a DXA scan. Regular x-rays will not give you the details (T-score and Z-score) your doctor needs to make an accurate diagnosis.
DXA (or DEXA) stands for Dual Energy X-Ray Absorptiometry. There are two types: Central and Peripheral. The first covers your entire skeleton; the second focuses on your extremities, such as your hands or feet.
In the US, Medicare covers the cost of your DXA scan every two years. If you need more scans, please check with your insurance provider for complete coverage details.
In Canada, the Federal Government says that if you’re 65 and never had a DXA, Canadian Medicare will cover it. They’ll also let you do follow-up DXAs if you need them, every 2 years and cover them. Sometimes, if your treatments are annual, Medicare will cover the cost.
What if you’re under 65? Most commercial providers will cover your initial DXA if you’re post-menopausal and you have risk factors (such as smoking, genetics, or being under- or overweight.)
If your health insurance does not cover the cost of your DXA scan, you will have to pay out of pocket.
Below is a directory of clinics that offer DXA scans in Canada:
Vancouver, British Columbia
Vancouver, British Columbia, Canada
Mobile DXA scans and body composition imaging in the Vancouver British Columbia area
Vancouver DEXA Scan
Medisys Montreal + (Medisys has other locations in Canada)
Suite 203 6100 Ave. Du Boise
Montreal, Quebec H3S2W1
Below is a directory of clinics that offer DXA scans in the United States:
- San Francisco, CA
- Atlanta, GA
- Chicago, IL
- Dallas, TX
- Las Vegas NV
- Madison, MS
- Philadelphia, PA
- Seattle, WA
- Tampa Bay, FL
Address: 1220 20th St
Miami Beach, FL, USA 33139
New York, NY
Park Avenue Radiologists, P.C.
525 Park Avenue @ 61st Street
New York, NY 10065
Phone: (212)-888-1000 (prompt 3)
More coming soon, if you would like to see your DXA scan clinic listed here please contact us.
Once you reach one of the milestones listed below, you should have a DXA scan every 2 years:
- You are a woman 65 or older
- You are a postmenopausal woman under 65
- You are a man 70 or older
- You are 50 or older and recently suffered a bone fracture, especially from a minor fall
I have a metal plate/object in my body (head, arm, leg etc.), is it still safe/effective to have a body composition scan?
Yes. Since the metal object will be present in both initial and future scans, the readings will still be helpful since there is no change in the object. The metal will not greatly affect readings. A DXA scan’s beams can’t interact with the metal object like an MRI machine’s will, so while the surrounding tissue will be classified incorrectly as bone, readings will still be consistent from scan to scan.