What is DXA - Bone Density?
DXA (pronounced DEXA) or Bone Density scan is a Dual-energy X-ray absorptiometry technology that uses a very low amount of X-ray energy to detect the presence of osteoporosis.
Bone mineral content tends to begin declining in people who are in their mid-30s or older, and the loss of bone tissue accelerates in women after menopause. Reduction of mineral content, characterized by porous and brittle bones, is known as osteoporosis. It’s a potentially serious condition because it makes bones more vulnerable to fractures and ultimately can lead to diminished mobility and independence.
DXA scanning can identify low bone density in patients at an early stage, enabling doctors to prescribe appropriate treatment before the condition worsens. Images of the lower spine and hips are most often used in checking for osteoporosis.
What To Expect
You will be asked to lie quietly on your back while a movable arm passes over your body.
A technician will remain with you and you will feel no sensations from the exam, which typically takes 15 to 30 minutes.
How To Prepare
You should not take any calcium supplements 24 hours before your exam. Wear comfortable clothing that has no metal zippers or buttons in the abdominal or pelvic areas. If you do not have clothing without metal components, we may ask you to change into a gown.
If you have recently undergone a barium study of any kind - such as an upper gastrointestinal (UGI) tract exam, barium enema or computed tomography (CT) scan -you should wait at least 14 days before a DXA exam is performed. That waiting period is important to prevent any residual barium from interfering with your DXA exam.