What happens during a bone density scan?
There are different ways to measure bone density. The most common and accurate way uses a procedure called dual-energy x-ray absorptiometry, also known as a DEXA scan. The scan is usually done in a radiologist's office.
During a DEXA scan:
You will lie on your back on a padded table. You will probably be able to leave your clothes on.
You may need to lie with your legs straight, or you may be asked to rest your legs on a padded platform.
A scanning machine will pass over your lower spine and hip. At the same time, another scanning machine called a photon generator will pass beneath you. The images from the two machines will be combined and sent to a computer. A health care provider will view the images on the computer screen.
While the machines are scanning, you will need to stay very still. You may be asked to hold your breath.
To measure bone density in the forearm, finger, hand, or foot, a provider may use a portable scanner known as a peripheral DEXA (p-DEXA) scan.
