Glossary of Medical Terms

free PSA

The amount of the protein prostate-specific antigen (PSA) in the blood that is not attached to other proteins. It is compared with the amount of PSA in the blood that is attached to other proteins. The amount of free PSA is higher in men with benign prostatic hyperplasia (BPH).The amount of PSA attached to other proteins is higher in men with prostate cancer.

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