DEXA Scan

A DEXA scan is the most widely used test for measuring bone density, which is a key indicator of how strong your bones are. The name stands for dual-energy X-ray absorptiometry, which describes how it works: the scanner sends two low-energy X-ray beams through the body and measures how much each is absorbed by bone. Because denser bone absorbs more, this difference can be translated into a precise measurement of bone mineral density, usually focusing on the hip and spine, where fractures matter most.

The experience itself is simple and comfortable. You lie still on a padded table while a scanning arm passes over you, and the test is over in a matter of minutes. There is nothing to enter, no enclosed space, and the radiation dose is very low, far less than that of many other X-ray tests. For most women, it is one of the easiest medical tests they will ever have, requiring no special preparation beyond wearing comfortable clothing.

The results are typically reported as a T-score and sometimes a Z-score. A T-score compares your bone density with that of a healthy young adult, and it is the number used to identify osteopenia (somewhat lower-than-normal density) or osteoporosis (more significantly reduced density). These results give your care team an objective starting point for understanding your bone health, tracking changes over time, and talking through what, if anything, might help keep your bones strong.

Bone loss usually happens quietly, without any symptoms, until a fracture occurs. A DEXA scan makes the invisible visible, revealing reduced bone strength early, while there is still time to act on it. For women, whose risk of bone loss rises notably around and after menopause, this kind of early insight can be especially valuable.

Because the scan is quick, painless, and low in radiation, it offers a great deal of useful information for very little inconvenience. Understanding what a DEXA scan measures helps you make sense of your results and take an active role in protecting your bone health over the years ahead, rather than learning about a problem only after a break has already happened.