Free PSA
Free PSA is the part of prostate-specific antigen (PSA) that circulates in the blood without being bound to other proteins.
Free PSA is the part of PSA (prostate-specific antigen) that circulates in the blood unbound. PSA is a protein made by the prostate gland. Free PSA is measured together with total PSA, and the two are often read as a ratio. Retesting shows how it changes over time.
PSA levels vary with age and the size of the prostate. Ejaculation, a long bike ride or a recent infection can raise PSA for a few days, and some medicines, such as 5-alpha-reductase inhibitors, lower it.
Foods that help
Tomatoes, cruciferous vegetables, fatty fish, walnuts and green tea as part of a varied diet.
Foods to limit
Large amounts of red and processed meat, high-fat dairy and alcohol.
Track it through the year
One value is a snapshot. Following it up shows whether what you changed is working.
Related markers
Educational information only — not a diagnosis. Every result is checked against safe limits, and anything critical is escalated for follow-up.
See all 84 markers →