Bone Density Interpretation (DXA T/Z-score, QCT, Opportunistic CT HU) — free guideline decision tool
DXA T- or Z-score by population, QCT lumbar volumetric BMD, and opportunistic L1 attenuation on routine CT, combined with fragility fracture status. Includes how to measure and what each value means. Instant, browser-side.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Method | QCT (mg/cm³) |
|---|---|
| Fragility fracture (hip / vertebra, etc.) | No |
| QCT lumbar vBMD | 95 mg/cm³ |
→QCT lumbar vBMD95mg/cm³
- QCT lumbar vBMD：95 mg/cm³ → 80–120: low bone mass
| Method | DXA |
|---|---|
| Population (DXA) | Postmenopausal women / men ≥ 50 (T-score) |
| Fragility fracture (hip / vertebra, etc.) | No |
| T-score (lowest site) | -2.7 |
→T-score (lowest site)-2.7
- T-score (lowest site)：-2.7 → ≤ −2.5: osteoporosis
Common questions
What is Bone Density Interpretation (DXA T/Z-score, QCT, Opportunistic CT HU)?
DXA T- or Z-score by population, QCT lumbar volumetric BMD, and opportunistic L1 attenuation on routine CT, combined with fragility fracture status. Includes how to measure and what each value means. Instant, browser-side.
How is Bone Density Interpretation (DXA T/Z-score, QCT, Opportunistic CT HU) calculated? What is the core formula?
T-score (lowest site) ≤ −2.5: osteoporosis T-score (lowest site) −2.5 < T < −1: low bone mass (osteopenia) T-score (lowest site) ≥ −1: normal Z-score ≤ −2.0: below expected range for age (avoid 'osteoporosis'; look for secondary causes) Z-score > −2.0: within expected range for age QCT lumbar vBMD < 80: osteoporosis QCT lumbar vBMD 80–120: low bone mass QCT lumbar vBMD > 120: normal L1 attenuation < 100 HU: osteoporosis likely — recommend DXA L1 attenuation 100–150 HU: low bone mass possible — consider DXA L1 attenuation ≥ 150 HU: osteoporosis unlikely
When is Bone Density Interpretation (DXA T/Z-score, QCT, Opportunistic CT HU) used?
Bone density imaging: DXA, QCT and opportunistic routine CT — osteoporosis diagnosis and referral.
What are the key clinical points for Bone Density Interpretation (DXA T/Z-score, QCT, Opportunistic CT HU)?
DXA: lowest T-score of L1–L4 (exclude fractured / degenerated levels, keep ≥ 2), femoral neck and total hip; T-score for postmenopausal women and men ≥ 50, Z-score for premenopausal women, men < 50 and children. Each value is graded against published reference ranges. Measurement technique and positioning change the numbers — compare like with like on follow-up. Part of the YuanDoctor MSK measurement topic.
What are the limits and cautions when using Bone Density Interpretation (DXA T/Z-score, QCT, Opportunistic CT HU)?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
Does Bone Density Interpretation (DXA T/Z-score, QCT, Opportunistic CT HU) upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
How is Bone Density Interpretation (DXA T/Z-score, QCT, Opportunistic CT HU) calculated in practice? Can you show a worked example?
Inputs: Method QCT (mg/cm³), Fragility fracture (hip / vertebra, etc.) No, QCT lumbar vBMD 95 mg/cm³ → Result: QCT lumbar vBMD 95 mg/cm³（QCT lumbar vBMD: 95 mg/cm³ → 80–120: low bone mass） Inputs: Method DXA, Population (DXA) Postmenopausal women / men ≥ 50 (T-score), Fragility fracture (hip / vertebra, etc.) No, T-score (lowest site) -2.7 → Result: T-score (lowest site) -2.7（T-score (lowest site): -2.7 → ≤ −2.5: osteoporosis）
Run Bone Density Interpretation (DXA T/Z-score, QCT, Opportunistic CT HU) now
DXA T- or Z-score by population, QCT lumbar volumetric BMD, and opportunistic L1 attenuation on routine CT, combined with fragility fracture status. Includes how to measure and what each value means. Instant, browser-side.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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