Prostate Volume (Ellipsoid) & PSA Density (PSAD) — free guideline decision tool
Ellipsoid prostate volume from three diameters, PSA density from PSA, and a PI-RADS-stratified biopsy cue. 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.
| PSA | 6.5 ng/mL |
|---|---|
| Length (sagittal craniocaudal) | 4.5 cm |
| Width (axial transverse) | 4.8 cm |
| Height (anteroposterior) | 3.6 cm |
| PI-RADS (optional) | PI-RADS 3 |
→PSAD0.161ng/mL²
- Prostate volume：40.4 mL (4.5×4.8×3.6×0.52); >30 mL enlarged
- PSAD：0.161 ng/mL²
- Biopsy cue：PI-RADS 3 with PSAD 0.10–0.20: intermediate; decide biopsy vs surveillance with clinical factors and patient preference.
Common questions
What is Prostate Volume (Ellipsoid) & PSA Density (PSAD)?
Ellipsoid prostate volume from three diameters, PSA density from PSA, and a PI-RADS-stratified biopsy cue. Instant, browser-side.
How is Prostate Volume (Ellipsoid) & PSA Density (PSAD) calculated? What is the core formula?
Volume = L × W × H × 0.52 (mL); PSAD = PSA / volume.
When is Prostate Volume (Ellipsoid) & PSA Density (PSAD) used?
Reporting prostate volume on MRI or TRUS and deciding on biopsy.
What are the key clinical points for Prostate Volume (Ellipsoid) & PSA Density (PSAD)?
Volume = L×W×H×0.52. PSAD = PSA / volume. 0.15 is the traditional cut-off. Stratify together with PI-RADS.
What are the limits and cautions when using Prostate Volume (Ellipsoid) & PSA Density (PSAD)?
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 Prostate Volume (Ellipsoid) & PSA Density (PSAD) 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 Prostate Volume (Ellipsoid) & PSA Density (PSAD) calculated in practice? Can you show a worked example?
Inputs: PSA 6.5 ng/mL, Length (sagittal craniocaudal) 4.5 cm, Width (axial transverse) 4.8 cm, Height (anteroposterior) 3.6 cm, PI-RADS (optional) PI-RADS 3 → Result: PSAD 0.161 ng/mL²（Prostate volume: 40.4 mL (4.5×4.8×3.6×0.52); >30 mL enlarged, PSAD: 0.161 ng/mL², Biopsy cue: PI-RADS 3 with PSAD 0.10–0.20: intermediate; decide biopsy vs surveillance with clinical factors and patient preference.）
Run Prostate Volume (Ellipsoid) & PSA Density (PSAD) now
Ellipsoid prostate volume from three diameters, PSA density from PSA, and a PI-RADS-stratified biopsy cue. Instant, browser-side.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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