Understanding PSA (Free): Normal vs Optimal Ranges

?What is PSA (Free)?

Free PSA measures the fraction of prostate-specific antigen circulating unbound. In prostate cancer, PSA is predominantly bound to proteins, resulting in a lower free/total PSA ratio. This ratio refines interpretation of borderline total PSA results in the 4-10 ng/mL grey zone.

!Why It Matters

A free PSA percentage below 10% significantly increases probability of prostate cancer; above 25% makes cancer much less likely. This ratio helps avoid unnecessary biopsies in men with benign prostatic hyperplasia driving their PSA elevation, while ensuring cancer detection in those at high risk.

Reference Ranges

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

• Prostate cancer is often asymptomatic early
• BPH symptoms: urinary frequency, weak stream, nocturia

How to Improve Your Levels

• 1Free PSA is a diagnostic tool, not something to directly improve
• 2Regular PSA monitoring if in the grey zone (4-10 ng/mL)
• 3MRI-guided biopsy in suspicious cases improves diagnostic accuracy

When to Test

When total PSA is 4–10 ng/mL to refine biopsy decision; alongside total PSA in annual prostate monitoring.

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