Understanding DXA Results: T-Scores, Z-Scores and What Happens Next
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A DXA report describes bone-density measurements, but the numbers need to be interpreted alongside your age, fracture history and other risk factors. The most useful outcome is a clear explanation of what happens next, rather than a score in isolation.
At a glance
- T-scores compare density with a young-adult reference.
- Z-scores compare density with an age-matched reference.
- Which score matters depends on the patient and clinical context.
- Bindex reports a Density Index, not a DXA T-score.
T-score versus Z-score
A T-score is a comparison with young-adult reference bone density. A Z-score uses an age-matched reference. ISCD official positions prefer T-scores in postmenopausal women and men aged 50 or over, and Z-scores before menopause and in men under 50.
Understanding the usual T-score categories
| T-score | Usual classification in appropriate adults |
|---|---|
| -1.0 or higher | Normal bone-density range |
| Below -1.0 and above -2.5 | Low bone mass, often called osteopenia |
| -2.5 or lower | Osteoporosis range |
These categories are not percentages of bone lost or a personal guarantee about fractures. They should not be applied indiscriminately to younger adults. A Z-score of -2.0 or lower is described as below the expected range for age; it is not automatically a diagnosis of osteoporosis.
Why fracture risk still matters
Two people with a similar measurement may have different clinical risks. NOGG guidance considers fracture history and other risk factors alongside density. Ask the clinician whether the report changes your risk assessment, whether treatment is appropriate and whether any underlying cause needs investigation.
What if the hip and spine results differ?
Do not average the scores yourself or pick the most reassuring number. Scan quality and the validity of each measurement matter. The reporting clinician should explain which sites were used and any limitations. Ask for clarification if the wording is unclear.
What should you ask after receiving the report?
- Which result is relevant to my assessment?
- Was the scan technically suitable for interpretation?
- How does my fracture history change the next step?
- Do I need treatment, further investigation or a follow-up plan?
- Who is responsible for arranging that plan?
Keep the complete report, not just a photograph of one number. If you move provider, share previous reports so the new clinician can understand the original assessment.
Why a Bindex result is different
Puri Pharmacy uses Bindex ultrasound within a wider bone-health assessment. Its Density Index is not a DXA T-score and should not be placed into the table above. Our Bindex guide explains what the measurement can and cannot tell you.
Frequently asked questions
Does osteopenia always become osteoporosis?
No. The label is not a prediction on its own; discuss your risk factors and recommended follow-up.
Is a T-score a percentage?
No. It is a statistical comparison with a reference population.
Can I diagnose osteoporosis using an online score table?
No. The scan, appropriate scoring system and clinical context need professional interpretation.
Can I compare a Bindex Density Index with my DXA score?
No. They are different measurements, and a change between them is not a valid monitoring trend.
Understand your test before arranging another
Bring existing results and referrals when enquiring about a bone-health assessment at Puri Pharmacy in Hillingdon or Southall. Our screening service does not replace the clinician’s interpretation of an existing DXA report.
View bone-health assessment and booking details
Suitability is assessed individually. Bindex screening does not replace a clinically required DXA scan, fracture investigation or specialist care.
