PSA Score Interpreter Calculator

This calculator combines four separate PSA-related calculations into one Overall risk score (0-100): how your PSA compares to an age-specific ceiling (2.5 ng/mL under 50, rising to 6.5 ng/mL at 70+), PSA density (PSA divided by prostate volume, flagged above 0.15 ng/mL/cc), PSA velocity (year-over-year change, flagged above 0.75 ng/mL/yr), and free PSA percentage (lower free-PSA share raises suspicion). PSA velocity only contributes when you enter a Prior PSA above zero -- leave it at the default and that entire term drops out of the risk score. Estimated cancer probability works differently: it only responds to your free PSA percentage while your PSA level sits in the 4-10 ng/mL "grey zone"; below 4 it reports a flat 5%, above 10 a flat 67%, regardless of free PSA.

PSA density moves directly with prostate volume and total PSA -- a larger prostate lowers density (more tissue diluting the same PSA) while a higher PSA level raises it. The age-normal comparison works differently: it only compares your PSA level against an age-based ceiling and never references prostate volume at all, so a larger or smaller prostate has no effect on whether you're flagged as above the age-normal limit. This tool applies the Oesterling 1993 age-adjusted PSA reference table to approximate risk; it is not a diagnostic test, and abnormal results always warrant a urologist's evaluation rather than self-interpretation.