Hormones
PSA % Free
LOINC 12841-3 · %
What it is
Free PSA percentage is the share of your PSA that circulates unbound. It helps refine prostate-cancer risk when total PSA is mildly raised.
Why it matters
It can help decide whether a biopsy is needed, since a lower percentage is more concerning.
What high values can mean
A higher percentage is generally more reassuring, suggesting a lower likelihood of prostate cancer.
What low values can mean
A lower percentage raises concern and may prompt further evaluation.
How to improve it
This is a diagnostic refinement, not something changed by lifestyle.
Food & lifestyle
No food changes the result; it is a calculation from your PSA tests.
Preparing for the test
Drawn with total and free PSA; avoid ejaculation and vigorous cycling for a couple of days before — follow your lab.
When to talk to a doctor
The free-PSA percentage is interpreted by a doctor alongside your total PSA and risk factors.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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