Free PSA % Test
The fraction of PSA not bound to other proteins. Helps distinguish benign prostate enlargement from cancer when total PSA is borderline.
What is Free PSA %?
The fraction of PSA not bound to other proteins. Helps distinguish benign prostate enlargement from cancer when total PSA is borderline.
Free PSA % Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| Male, age 18+ | 25.0 – 100 % |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
What your Free PSA % result may mean
A low free PSA % (<25%) when total PSA is borderline raises concern for prostate cancer.
Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
Related Heart Health biomarkers
Markers commonly tested alongside Free PSA %.
Frequently asked
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