What is bone density scanning? Bone density scanning, or dual-emission X-ray absorptiometry (DXA or DEXA) uses low-dose X-ray energy to measure the bone-mineral density of bones. How is the result of a bone density test reported? The result of a bone density test is expressed as a “T-score,” which is how your bone density compares to a healthy 30-year-old of the same sex and ethnicity. How accurate is a T-score? T-score is very controversial in that it sets a cutoff