Free PSA % levels: what's normal, high and low
The fraction of PSA not bound to other proteins. Helps distinguish benign prostate enlargement from cancer when total PSA is borderline.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
The short answer
Free PSA % is measured with a standard blood draw; no fasting is needed. A typical reference range is 25.0 – 100 %. At TestWell it's $48.99 all-in as PSA, Free & Total, results in 2–5 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis.
- Units
- %
- Sample
- Blood draw
- Fasting
- Not required
- Results
- 2–5 business days
- Price
- $48.99
- Labs
- Quest or Labcorp · BioReference in NY/NJ
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.
What a low Free PSA % means: causes, symptoms, next steps →Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
How do you get a Free PSA % test?
Order online, a licensed physician reviews the requisition, and you walk into a nearby lab for the draw. Free PSA % is available on its own or inside these panels — panels cost less per marker when you want the fuller picture.
| Option | Includes | Price |
|---|---|---|
| PSA, Free & Total | This marker only | $48.99 |
| Men's Health Advanced Panel | 22 tests | $299.99 |
Quest vs. Labcorp for Free PSA %: which lab should you pick?
Both are CLIA-certified national labs and the result is clinically equivalent, so pick whichever location is closer. Your report will print that lab's own reference range, which can differ slightly from the table above.
| Lab | Available | Price |
|---|---|---|
| Quest Diagnostics | Yes | $48.99 |
| Labcorp | Yes | $48.99 |
| BioReference (NY & NJ) | Yes | $55.99 |
Need help choosing a location? Use the lab finder to see draw sites near your ZIP.
Related Heart Health biomarkers
Markers commonly tested alongside Free PSA %.
Frequently asked
A low free PSA % (<25%) when total PSA is borderline raises concern for prostate cancer. A single result below the reference range is a prompt to look closer with a clinician — often a repeat test and related markers — not a diagnosis on its own.
Ready to test your free psa %?
Order in two minutes, get physician-approved, and visit a lab the same day. Starts at $48.99.