DeXA FAQs

 DeXA Frequently asked Questions

What does DeXA stand for?

DeXA stands for Dual energy X-ray Absorptiometry.

What does it measure?

The DeXA scanner measures the density of bones and compares the result to a normal range. This test is currently the most accurate and reliable means of assessing the strength of your bones and hence your risk of fracture. It is also used to diagnose osteoporosis and monitor the effects of treatment.

Can the scanner tell me if I have arthritis or other ‘bone’ conditions?

No, the DeXA scanner can only look at bone density.

Are there any risks involved?

All x-ray procedures involve exposure to radiation in varying amounts. Although we are all exposed to small amounts of background radiation from the environment throughout our lives, the length and level of exposure to radiation from X-rays in medical procedures is strictly controlled and kept to the minimum possible. In this procedure, you will only be subjected to an amount of radiation less than we receive naturally from the environment in one day, in other words, very low.

How long will the procedure take?

The entire scan time should be no longer than 20 minutes; this includes discussing a lifestyle questionnaire to determine your risk of osteoporosis and preparing for the scan itself.

Do I have to make any special preparations?

There are no special preparations, you may eat and drink as normal prior to the examination, and we do ask that you wear as little metal as possible, especially around your waist area. Under-wired bra’s need to be removed, as do body piercings.

What happens during the scan?

The DeXA technician will go through the lifestyle questionnaire with you; this gives an overall picture of any risk factors, which include such information as smoking, diet, drinking and other health issues. The machine will take 2 measurements, a hip joint, usually the left hip, and the bottom four vertebrae. You will be required to lie flat for the duration of the scan; however your legs will be elevated for part of the scan.

Will I feel anything?

The only sensation you will feel will be the vibrating of the machine and the movement of the couch.

When will I get my results?

Your results will be sent to your referring clinician within 4 working days.

Can I bring a relative or friend with me?

You are very welcome to bring a relative or friend; we have comfortable waiting areas. For reason of safety, they will not be able to come into the scanning room with you unless there are extenuating circumstances.