What Your Bone Mineral Density T Score Indicates?
A bone mineral density test measures the density of minerals such as calcium in your bones using a special X-ray or computed tomography (CT) scan. This information enables you to estimate the strength of your bones. The T-score of your BMD test indicates how much your bone density is above or below normal. The World Health Organization (WHO) has defined the T-score.
The medical experts use the bone mineral density T-score to diagnose osteoporosis. In case, more than one bone is tested, they use the lowest T-score to make a diagnosis of osteoporosis. The T score compares your bone density with that of 30-year-old healthy young women. At 30, women reach maximum peak density. Peak bone density is the point at which a person has the highest bone density. It is expressed as a standard deviation (SD). It is the deviation from the young adult mean that enables doctors to estimate the condition of your bones. Almost all 30-year-old people have a BMD value within 2 standard deviations of this mean.
A negative value indicates that you have thinner bones (lower bone density) than an average 30-year-old. The more negative the T-score is the less bone density you have compared to an average 30-year-old.
A positive value indicates that your bones are thicker and stronger than an average 30-year-old.
What your T-score means:
The more negative your T-score, the greater your chances of breaking a bone during a fall or from a minor injury. So you need to take extra care of yourself if your bone mineral density T score is less than -2.5.