My doctor gave me a T-score. What does it actually mean, and what else should I be tracking?
Here's the point
A T-score compares your bone density to that of a healthy young adult, measured in standard deviations: -1.0 and above is normal, -1.0 to -2.5 is osteopenia, and -2.5 or below is osteoporosis. But it's just one snapshot of density — it doesn't capture bone quality, your fall risk, or your overall fracture probability, so it's worth tracking several other things alongside it and discussing them with your physician.
The T-score comes from a DEXA scan, which passes X-ray beams through your hip and spine to measure mineral density. It's worth knowing those WHO cut-offs are statistical conventions used for research and reimbursement, not biological cliffs — nothing dramatic changes in your skeleton between a -2.4 and a -2.6. Your report will also list separate sites (spine, femoral neck, total hip), and they often disagree, with diagnosis conventionally based on the lowest valid site.
One of the most useful things to understand is precision: every DEXA machine has measurement error, and the smallest change that counts as real rather than noise is called the Least Significant Change, typically around 3-5% at the spine. A small shift between scans may just be noise, not a true change. It's best to rescan on the same machine at the same facility, and to space scans out, since real change takes time to show up.
Density alone isn't the whole story of bone strength — architecture and quality matter too. Trabecular Bone Score, run on the same spine image, adds information about how well-connected your internal bone scaffolding is. Blood markers called CTX and P1NP reflect how fast bone is being broken down versus built, and can show trends within weeks to months, though they're best compared to your own past results rather than to anyone else's.
It's also worth asking your physician about your FRAX score, which combines your T-score with factors like age, prior fractures, and family history to estimate your actual 10-year fracture probability — this is often more clinically meaningful than the T-score alone. Other useful blood work includes 25-hydroxy vitamin D, calcium, parathyroid hormone, and thyroid function, since these can reveal correctable contributors to bone loss. Keeping a simple record of your scores, scan dates, labs, and fracture history gives you and your physician a much clearer trend to work from than any single number.
Know these words
A T-score shows how your bone density compares to a healthy young adult, measured in standard deviations, and it's…
A Z-score compares your bone density to other people your own age and sex, which matters most for younger adults,…
A DEXA scan is a low-radiation X-ray test that measures how much mineral is in your hip and spine bones, giving you…
Least Significant Change (LSC) is the smallest change in a DEXA scan result that's big enough to count as real,…
Trabecular Bone Score (TBS) is a measurement taken from your spine DEXA image that estimates how well-connected your…
FRAX is a free online tool that calculates your 10-year probability of having a major osteoporotic fracture or hip…
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More on tests and numbers
Osteopenia and osteoporosis are both based on your DEXA T-score, just at different points on the same scale. A T-score between -1.0 and -2.5 is called osteopenia (lower-than-average bone mineral density), while -2.5 or below is called osteoporosis (more significant bone loss). They're not two different diseases — they're a continuum, and the cut-off points are statistical conventions used for research and reimbursement, not a biological cliff where something suddenly changes in your skeleton.
Read the full answer →A T-score compares your bone density to that of a healthy young adult at peak bone mass, and it's the number used to apply the standard categories of normal, osteopenia, or osteoporosis. A Z-score instead compares you to people of your own age and sex, which makes it the more appropriate number for anyone premenopausal, for men under 50, and for children, since a T-score can be misleading in those groups.
Read the full answer →A DEXA scan uses a low dose of X-ray to measure bone mineral density at the hip and spine, and it's the long-established standard that generates your T-score. A REMS scan uses ultrasound instead of radiation to assess the same areas, comparing the echo signal to reference models to produce its own T-score (not directly interchangeable with a DEXA T-score) plus a separate "fragility score" reflecting tissue quality. REMS is newer, has less long-term data, and is best used alongside DEXA rather than replacing it, especially if you already have a DEXA history.
Read the full answer →For most people, the honest answer is every 1 to 2 years. DEXA machines have a built-in measurement error, and most facilities can't reliably detect a real change in bone density sooner than that — a small shift of 1-2% on your scan often just reflects machine noise, not actual bone loss or gain. Your physician can tell you the right interval for your specific situation.
Read the full answer →CTX and P1NP are blood tests that show how fast your bone remodeling is happening right now, rather than where your bone density stands. CTX reflects how quickly bone is being broken down, and P1NP reflects how quickly new bone is being built. Unlike a density scan, which takes a year or more to show change, these markers can shift within weeks to months, so they're useful for tracking your own trend over time.
Read the full answer →Have a question that isn't here? Ask us at your next visit, or ask our AI bone health advisor.
Education only, not medical advice. Decisions about tests, medications and treatment belong with your own doctor. OsteoStrong does not diagnose, treat or cure any disease.
