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Prostate

PSA (free)

The portion of PSA circulating unattached to blood proteins.

Unit ng/mL
What it is

The portion of PSA circulating unattached to blood proteins.

Why it matters

On its own it is not read; it exists to be divided by the total, and the ratio is what carries the information.

Reading the number

It is measured only when the total sits in the borderline band where the ratio helps. The free fraction is less stable in the tube than the total, so a delayed sample lowers it and pushes the ratio down artefactually.

What moves it
sample handling and delayrecent ejaculationcyclingprostate examination
Read alongside
PSA (total)PSA free/total ratio
When to raise it

Worth reading through the ratio rather than as a value on its own.

Tracking only, not a diagnosis. The range above is a typical adult reference range — the range printed by the lab that ran your test is the one that applies to you. Discuss anything that concerns you with your doctor.

Also known as

On a report in another language.

A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under PSA (free).

PSA LivrePSA fracção livrePSA Fração LivrefPSAVaba PSAFreies PSAPSA LibreFree PSA

Track your psa (free) over time.

PSA (free) is one of 165 analytes Vitals Vault charts over time. Import a lab report in any language and this number lands on a timeline only you can read.

Continue with Google
Tracking only. This app is not medical advice. Always discuss results and future analysis with your doctor.

Catalog entry last updated 2026-08-28. Browse all 165 metrics.