What is the Normal Range for Bone Density?

A DEXA scan is considered the “gold standard” when it comes to measuring bone mineral content and density. DEXA scans are a great tool for assessing your risk of osteoporosis and for detecting weak or brittle bones to help predict the odds of a future fracture.

The normal range for bone density, measured as a T-score, varies depending on age, sex, and race. For instance, White and Asian populations generally have lower bone density than Black and Hispanic populations.

In addition, bone density typically increases from birth to age 30, but then generally declines with age, especially in women post-menopause. As we age, the rate of bone loss continues to increase leading to more brittle bones in older populations.

All that being said, when you get a DEXA scan your bone density is compared to the average bone mineral density (BMD) of an adult of your sex and race at the age of peak bone mass (approximately age 25 to 30). The result is your T-score.

• A T-score of -1 to +1 is considered normal bone density.
• A T-score of -1 to -2.5 indicates osteopenia (low bone density).
• A T-score of -2.5 or lower is bone density low enough to be categorized as osteoporosis.

It’s important to know that every one-point drop below 0 (0 is BMD on par with a 25- to 35-year-old) doubles the risk for a fracture.

Your DEXA scan results will also provide you with a Z-Score. The Z-Score shows how your bone density compares to the bone densities of others who are the same age, sex, and ethnicity.

So while a T-Score compares your bone density to an adult of your sex and race at the peak of bone mass (25-30 year olds), a Z-Score compares your bone density to an adult of your sex, race, and age.

A low Z-Score, often considered below -2.0, suggests you have less bone mass than your peers, which could point to an underlying health problem or condition affecting bone growth.

Fortunately, there are steps you can take at home and with your doctor’s help to protect against painful fractures. To get an accurate representation of your T-Scores and Z-scores, we recommend booking a DEXA scan today.