Divide the change in PSA by the years between tests. The velocity matters as much as the level, because cancer moves PSA faster than benign growth.
PSA velocity
— ng/mL/yr
📊
Your visual report appears here
Fill in the form and press Calculate. You will get your number, an interpretation chip, and a personalized chart pack drawn instantly in your browser.
- Risk spectrum with your position marked
- Reference ranges from the original publication
- Shareable link, nothing stored
Scientific references
Why speed over level
A PSA of 2.5 rising from 1.0 in two years alarms urologists more than a stable 4.0 held for a decade. The classic concern threshold is a rise faster than 0.75 ng/mL per year.
Understanding your result
- 0.35 or slower matches benign variation
- 0.35 to 0.75 is a watch zone
- Faster than 0.75 per year is the classic trigger for imaging or biopsy discussion
Noise sources
Infection, cycling, ejaculation within two days and even the assay lab move PSA. Confirm a fast velocity with a repeat before escalating.
Same lab rule
Assays differ by up to twenty percent between laboratories, so velocity calculations are cleanest when every test comes from the same lab.