If you've just had a DEXA scan — or you're waiting for one, or your GP has told you that you have "low bone density" or "osteoporosis" — the first thing to understand is that a single number on a report rarely tells you what to do next. The T-score matters, but it's only part of the picture. This article walks through exactly how to read your DEXA result, why fracture risk (not the number alone) decides treatment, who genuinely needs medication versus lifestyle change, the secondary causes worth ruling out, and one deficiency that South Asians in Canada should check specifically.
What a DEXA scan actually measures
A DEXA scan (dual-energy X-ray absorptiometry) measures your bone mineral density — how much mineral is packed into your bones, usually measured at the hip and lumbar spine. It's quick, low-radiation, and painless. The scan converts your density into two comparison scores, and understanding the difference between them is the key to reading your report.
T-score vs Z-score — the distinction that matters
Your T-score compares your bone density to that of a healthy young adult at peak bone mass. This is the number used to diagnose osteoporosis. Your Z-score compares you to others of your own age and sex. A Z-score that's unexpectedly low (typically below -2.0) is a flag that something other than normal ageing may be driving your bone loss — a signal to look for a secondary cause rather than assuming it's age alone.
How to read your T-score
The World Health Organization thresholds — used across Canada — sort the T-score into three bands:
| T-score | Category | What it means |
|---|---|---|
| ≥ -1.0 | Normal | Bone density in the healthy range |
| -1.0 to -2.5 | Osteopenia (low bone mass) | Below normal, but not osteoporosis — risk depends heavily on other factors |
| ≤ -2.5 | Osteoporosis | Significantly reduced density; higher fracture risk |
So a T-score of -2.5 or lower is osteoporosis; a T-score between -1.0 and -2.5 is osteopenia (low bone mass); and -1.0 or above is normal. But here's the part that surprises most people: two patients with an identical T-score of -2.3 can have completely different treatment plans. The reason is fracture risk.
Why fracture risk matters more than the number alone
Osteoporosis treatment exists to prevent fractures — not to improve a number on a scan. So the question that actually drives the decision isn't "what's your T-score?" but "what's your chance of breaking a bone in the next ten years?" Two validated tools answer that:
- FRAX — the WHO fracture risk assessment tool. It combines your T-score with age, sex, weight, prior fracture history, parental hip fracture, smoking, alcohol, glucocorticoid use, and conditions like rheumatoid arthritis to estimate your 10-year probability of a major osteoporotic fracture.
- CAROC — the Canadian tool used widely alongside FRAX, sorting patients into low, moderate, or high 10-year fracture risk.
This is why the number alone can mislead. A 55-year-old with a T-score of -2.6 and no other risk factors may have a lower ten-year fracture risk than a 75-year-old with a T-score of -2.0 who has already broken a wrist. The tools capture that; the T-score in isolation does not.
And there's one rule that overrides the score entirely: a prior fragility fracture — a break from a fall from standing height or less — is itself diagnostic of osteoporosis, regardless of what the T-score says. If you've fractured a hip, spine, wrist, or shoulder from a minor fall, that history alone puts you in a treatment conversation even if your DEXA number looks only mildly low.
When you discuss your DEXA result, ask three specific things: a vitamin D level, a calcium level, and a FRAX (or CAROC) 10-year fracture-risk estimate based on your full history. Those three turn a bare T-score into an actual plan — and they're exactly what a specialist needs to tell you whether you need medication or just lifestyle change.
Who needs medication vs lifestyle — and where the line falls
This is the question most people actually came for. The honest answer is that it depends on your fracture risk, but the general shape is clear.
Lower risk — lifestyle and supplementation first
For people at lower fracture risk — often those with osteopenia and no prior fragility fracture — the foundation is not a prescription. It's:
- Adequate calcium, ideally from diet — dairy, fortified alternatives, leafy greens, tofu. Food sources are preferred over high-dose supplements.
- Vitamin D — necessary for calcium absorption and bone health, and commonly low in Canada (more on this below).
- Weight-bearing and resistance exercise — walking, stair-climbing, and strength training all load bone and help maintain density.
- Fall prevention — since most fractures come from falls: vision checks, home hazard removal, balance work.
- Stop smoking and limit alcohol — both directly accelerate bone loss.
Higher risk — pharmacotherapy
When fracture risk is high — or when you've already had a fragility fracture — medication is usually recommended alongside those lifestyle measures:
- Bisphosphonates (such as alendronate or risedronate) are first-line for most patients.
- Denosumab is an alternative injectable option, often used where bisphosphonates aren't suitable.
- Anabolic agents (bone-building therapies) are reserved for very high fracture risk — for example, after multiple or severe fractures.
Deciding which of these applies to you is exactly the kind of judgement that benefits from specialist input — and where a written opinion on your specific numbers can save months of uncertainty.
Secondary causes worth checking
Not all bone loss is "just ageing." Before settling on a plan, it's worth ruling out treatable contributors — especially if your Z-score is unexpectedly low or you're younger than typical. Common secondary causes and the tests that catch them include:
- Vitamin D deficiency — a serum 25-hydroxyvitamin D level.
- Calcium and parathyroid problems — serum calcium (and, if indicated, PTH).
- Thyroid disease — an overactive thyroid drives bone loss, so a TSH is worth checking. Our companion piece on what a TSH result actually means explains the bone–thyroid link in more detail.
- Coeliac disease — impaired absorption of calcium and vitamin D; screening bloodwork can flag it.
- Kidney disease, glucocorticoid use, and other conditions — worth reviewing with your history.
The South Asian angle — check your vitamin D
There's a specific reason this matters more for South Asians in Canada. Vitamin D deficiency is highly prevalent among South Asians here — the result of darker skin (which produces less vitamin D from limited Canadian sunlight), less sun exposure through long winters, and dietary factors. Vitamin D is essential for calcium absorption, so a deficiency directly impairs bone health. On top of that, South Asian populations tend toward lower peak bone mass to begin with — meaning there's less bone in reserve as density declines with age.
Put those together and the message is practical: if you're of South Asian background and you've had a DEXA scan or been told your bone density is low, checking your vitamin D and calcium isn't optional box-ticking — it's addressing one of the most common and correctable drivers of poor bone health in your specific group.
What about the DEXA scan wait itself?
DEXA scan wait times in Canada vary widely — by province, by facility, and by how the referral is prioritised. In some regions a routine bone-density scan is available within a few weeks; in others the wait, plus the subsequent specialist follow-up to interpret it, stretches much longer. If you're facing a delay getting your result interpreted — or you already have the report in hand and just want to know what it means and what to do — that gap is exactly where an early specialist opinion helps. And if a fracture or joint problem is part of your picture, our overview of orthopaedic surgeon wait times in BC covers what to expect on that side.
How a specialist opinion from Ginie Health works
Here's the service in plain terms for your situation — someone holding a DEXA report, or told they have low bone density, and unsure whether it's serious. You upload your DEXA result and any bloodwork, and describe your history. Within 6 hours, for $45 CAD, you receive a written clinical opinion from a specialist trained at PGIMER Chandigarh or AIIMS — among the finest medical institutions in the subcontinent. For the South Asian community in Canada, those names carry real weight: they're where family members back home often receive their own care.
The written opinion explains what your T-score actually means, estimates your fracture risk, flags secondary causes worth checking (including vitamin D), and tells you whether your situation calls for lifestyle measures or medication — and precisely what to raise with your GP. It doesn't replace your Canadian care; it makes every appointment count. If you'd rather talk it through, a live video consultation is available for $75 CAD. No referral required for either.