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Home >Information for Patients > Dictionary Index

Dictionary of Cancer Terms

View in Spanish: APE libre

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.



 
 
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.