Possible Complications
An x-ray uses radiation to make images. The low levels of radiation from a single x-ray will not affect most people. If you are pregnant or think you may be pregnant, talk to your doctor before the x-ray. Radiation may be harmful to developing babies.
Reasons for Test
This test will help the doctor assess the thickness of the bones.
It will help determine if a person has osteoporosis,
a bone-thinning disease. This information may be used to predict the risk of bone
fractures.
What to Expect
Prior to Test
The care team may ask you to:
- Eat normally on the day of the test
- Wait up to 2 weeks before having a DEXA scan if :
- You have had a barium study OR
- You have been injected with contrast dye for a CT scan or MRI scan
- Wear loose, comfortable clothing
- Not wear clothing with metal zippers, belts, or buttons
- Let them know if there is any possibility you are pregnant
Description of Test
Central DXA
This test measures bone thickness in the hip and spine. You
will be asked to lie on a table. Your position will depend on the area being
examined. You will be asked to hold still and may be asked to hold your breath
while the X-ray is taken. The X-ray will be taken and sent to a computer
monitor.
Peripheral DXA
This test measures bone thickness in the finger, hand,
forearm, or foot. The area being examined will be placed in a small device. The
device will provide a bone density reading in a few minutes.
After Test
You will be able to leave after the test is done.
How Long Will It Take?
About 10 minutes
Will It Hurt?
No
Results
The test results are usually available within a few days. Your test results will show 2 types of scores:
- T score—This number shows the amount of bone you have compared to a young adult
of the same gender with peak bone mass. A score above -1 is considered normal. A
score between -1 and -2.5 may mean you have osteopenia, the first stage of bone
loss. A score below -2.5 means you may have osteoporosis.
- Z score—This number shows the amount of bone you have compared to other people of
your age group, gender, and race. A score below -2 is considered abnormal.
These test results will help your doctor determine your risk for bone fractures.
Call Your Doctor
Call your doctor if you have any questions about your condition, the test, or your test results.
