psa velocity calculator

Enter at least 2 PSA test results with dates. Using more points (3–5) gives a more stable trend estimate.

Test 1

Date

PSA (ng/mL)

Test 2

Date

PSA (ng/mL)

Test 3

Date

PSA (ng/mL)

Test 4

Date

PSA (ng/mL)

Test 5

Date

PSA (ng/mL)

Formula: slope of PSA vs. time (years), using linear regression across all entered measurements.

This tool is for education only and does not diagnose prostate cancer. PSA interpretation should always be done with your clinician, considering age, prostate size, infection, medications, and imaging/biopsy findings.

What Is PSA Velocity?

PSA velocity is the rate of change in prostate-specific antigen (PSA) over time, usually expressed in ng/mL per year. Instead of looking at one isolated lab result, PSA velocity focuses on the trend. A rising trend can sometimes provide additional context during prostate cancer screening and ongoing prostate health monitoring.

Because PSA can fluctuate for reasons unrelated to cancer (such as prostatitis, benign prostatic hyperplasia, recent ejaculation, or urinary procedures), trend analysis is often more useful than reacting to a single number.

How This PSA Velocity Calculator Works

1) Enter serial PSA values with test dates

You can enter between 2 and 5 data points. For best accuracy, use results from the same laboratory method when possible.

2) The calculator estimates the slope

The script converts each test date into elapsed years and calculates a best-fit line (linear regression). The slope of that line is your PSA velocity.

3) You get an interpretable output

PSA velocity (ng/mL/year)
Simple annualized change from first to last test
Percent change per year (when baseline PSA is above zero)
Estimated PSA doubling time from log-linear modeling when mathematically valid

Clinical context matters: A value that looks concerning in one person may be less significant in another, depending on age, family history, MRI findings, free PSA ratio, prostate volume, and prior biopsy history.

How to Use PSA Velocity Responsibly

Collect clean data

Use test dates that are spread out in time (not all in the same week).
Avoid mixing units or inconsistent assays.
If you had an infection or urinary retention, discuss whether that test should be repeated before trend decisions.

Interpret thresholds with caution

You may see commonly referenced cut points (for example, around 0.35 or 0.75 ng/mL/year), but modern guidance emphasizes that no single threshold should drive major decisions by itself.

Pair trend with other tools

Digital rectal exam
Multiparametric MRI
PSA density and free PSA
Risk calculators and shared decision-making

Limitations of PSA Velocity

PSA velocity can be noisy if based on too few points, short intervals, or biologically variable data. It is best viewed as one signal among many. A fast rise may increase suspicion, while a flat or decreasing trend can be reassuring—but neither pattern alone can confirm or exclude disease.

Frequently Asked Questions

Is a negative PSA velocity good?

Usually, a negative value means PSA is declining over the time window measured. That can occur naturally or after treatment, but interpretation still depends on your specific clinical scenario.

How many PSA tests should I include?

At least two are required, but three to five usually provide a better estimate of true trend.

Does this replace medical advice?

No. This PSA velocity calculator is educational and should support, not replace, a conversation with a qualified healthcare professional.