What is Free PSA?
refines your PSA result
Free PSA and the ratio of free to total PSA help distinguish benign prostate conditions from cancer when total PSA is raised.
A higher proportion of free PSA suggests a benign cause, while a lower proportion raises suspicion of cancer. The value is most useful when PSA is between 4 and 10.
Test facts
- Unit
- %
- Sample
- Serum
- Fasting
- No fasting needed
- Turnaround
- 2 days
What does low Free PSA mean?
A low free/total PSA ratio raises suspicion of prostate cancer.
What does high Free PSA mean?
A high free/total PSA ratio points to benign prostate enlargement.
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This is general information about the marker, not an assessment of your values and not medical advice. Last updated: May 2026.