What is a "DEXA" scan? DEXA is an abbreviation for "Dual Energy X-ray Absorptiometry". This is a special x-ray procedure that determines the strength of your bones. Bone strength is assessed by measuring the bone density so a DEXA scanner is sometimes called a "bone densitometer." Other means of assessing bone strength are also available but a DEXA scan is currently the most accurate method and it uses the lowest amount of radiation (a standard chest x-ray exposes you to 10 times more radiation than a DEXA scan).
How is a DEXA scan done? Basically, all you have to do is lie flat on a table while the scanner moves over the top of your body. Generally, the bone density is measured at different sites in the body, usually both hips (or femurs) and the spine (or vertebral column). If you have had both hips surgically replaced or if you have had surgery on your spine, an alternative site may be chosen. Also, if your weight exceeds the table limit (300 pounds), a forearm scan may be substituted. The actual scanning time is about 10 minutes per site but you should allot 40 minutes for the entire procedure.
Preparation for the test Plan to arrive at Dr. Armstong's office about 10 minutes prior to your appointment time. You will need to fill out a history form. In addition, you should note the following information:
CLOTHING: Wear loose comfortable clothing. No metal buttons, zippers, or snaps. Do not wear a girdle. Do not wear blue jeans.
DIET/MEDICATION: If you are taking a calcium supplement, do not use it for 48 hours before your exam.
PAST MEDICAL HISTORY: Remind the technologist if you have had any back or hip surgery.
If your DEXA scan shows osteoporosis and you are started on a prescription medication to treat osteoporosis, a DEXA scan performed 1 year after starting treatment will be covered. A repeat screening DEXA is covered once every 24 months
