wellnesscenterusa.comPosted on 12/09/2007 by Karilee Bingham, R.N., B.S.
Bone density scanning, or dual-energy x-ray absorptiometry (DXA or DEXA) is a form of radiograph that is used to measure bone loss. DEXA is today's established standard for measuring bone mineral density.
An x-ray (radiograph) is a painless medical test that helps health care providers diagnose osteoporosis. It utilizes a very small amount of radiation (about as much as you would get from flying across the US) to produce images of your bones.
During the exam, you will be asked to lay on a padded table as an arm "scans" over you. It's important to remember to wear clothing that is free of zippers or buttons made of metal, and forgo wearing any jewelry as these items may interfere with the x-ray images. Recommendations also include refraining from calcium supplements for at least 24 hours before your exam, and no exposure to other radiographic tests with barium or contrast dye within 14 days prior to your DEXA. If there is any chance you may be pregnant, you should avoid the DEXA and any other tests that involve any amount of radiation.
Your results are reported in the form of a T-score, which is used to estimate your risk of developing a fracture. A score above -1 is considered normal, while a score below -2.5 is defined as osteoporosis. Anywhere in the middle indicates that you have osteopenia, or the first stages of bone loss.
Approximately 47% of women over 50 will sustain an osteoporotic fracture in their lifetime, it's vital to consider preventive therapy for this condition.
The current recommendation for daily calcium intake is 1000 mg/day of calcium with 400 to 800 IU (international units) of Vitamin D for women ages 19-50. From year 51 to 70 or older, the recommended daily dose is 1200mg/day. Vitamin D is an essential component to preventing osteoporosis. Without Vitamin D, only 10-15% of your dietary calcium will be absorbed. Further, if you have had a DEXA Scan, and your healthcare provider has diagnosed you with osteopenia, there are several prescribed medications you can take to prevent the onset of osteoporosis. As always, check with your provider if you have any questions about this condition.