PSA Doubling Time Calculator (PSADT)

Your details

The earlier PSA measurement, in nanograms per millilitre.
ng/mL
The more recent PSA measurement, in nanograms per millilitre.
ng/mL
The interval in months between the two PSA tests. Minimum recommended is about 1-3 months for a meaningful estimate.
months
PSA Doubling TimeModerate Risk
7.4months

Estimated time for PSA to double at its current rate of rise

Doubling Time (years)0.62years
PSA Slope0.0933ln(ng/mL)/month
PSA Velocity0.15ng/mL/month
PSA Velocity (per year)1.8ng/mL/yr
Risk CategoryModerate Risk (PSADT 6-12 months)
7.4 months
Very High Risk<3High Risk3-6Moderate Risk6-12Favourable12+

PSA doubling time is 7.4 months - moderate risk.

  • PSA rose from 1.2 ng/mL to 2.1 ng/mL, giving a velocity of 0.150 ng/mL per month (1.80 ng/mL per year).
  • A doubling time of 6-12 months represents moderate risk. Ongoing surveillance and individualised treatment planning are recommended.
  • Many clinicians use a 6-month threshold to distinguish aggressive from indolent recurrence.
  • PSADT is a prognostic marker, not a diagnostic test. It must be interpreted alongside PSA absolute value, Gleason/ISUP grade, clinical stage, and treatment history.

Next stepShare this result with your urologist or radiation oncologist. Management decisions depend on your complete clinical picture, not on PSADT alone.

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