🔬 PSA Doubling Time (PSADT)
UseWhen to use: biochemical recurrence or active-surveillance kinetics counseling.
StrataShorter PSADT marks faster kinetics (teaching concern often <3–10 months).
LimitsWhen not to use: falling PSA / assay change unlabeled. · Pitfall: near LOD noise. · Not a sole ADT order.
SourcePSA doubling time log-linear two-point formula (urology practice)
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
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Methodology · worked example, guidelines & full notes
Log-linear two-point.
When to use
When to use: biochemical recurrence or active-surveillance kinetics counseling.
How it works
PSADT = ln(2) × Δt / (ln PSA₂ − ln PSA₁).
Key points
- Log-linear two-point.
- Months unit.
- Next: imaging / multi-point fit.
References
- PSA doubling time log-linear two-point formula (urology practice)
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.
| PSA₁ (earlier) | 2.0 ng/mL |
|---|---|
| PSA₂ (later) | 4.0 ng/mL |
| Time between PSAs | 6 months |
→PSADT6.0months
- Δt：6 mo
- Cue：3–10 months — intermediate
Verification & sources · governance
FAQ
Frequently asked questions
- Does PSA Doubling Time (PSADT) 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 PSA Doubling Time (PSADT) calculated in practice? Can you show a worked example?
- Inputs: PSA₁ (earlier) 2.0 ng/mL, PSA₂ (later) 4.0 ng/mL, Time between PSAs 6 months → Result: PSADT 6.0 months（Δt: 6 mo, Cue: 3–10 months — intermediate）