Definitions for "Bone mineral density"
a measurement of bone that denotes its ability to resist fracture.
The absorption of X-rays indicating the amount of mineral (mostly calcium) present in bone. In general, the more BMD, the stronger the bones.
a measure of the amount of bone and its mineral. There are several kinds but one called DXA uses very low doses of X-rays to make an accurate assessment. The two sites of BMD usually measured are in the lower spine (lumbar vertebrae numbers 1-4) and in the total hip. BMD should be repeated in the same season and no more frequently than every two years to obtain an accurate estimate of change. Standard deviations below average BMD for young women are called T Scores. A T Score lower than –2.5 is considered osteoporosis, and lower than –1.0 to -2.4 is called osteopenia.