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Prostate-specific antigen (PSA), also known as gamma-seminoprotein or kallikrein-3 (KLK3), P-30 antigen, is a glycoprotein enzyme encoded in humans by the KLK3 gene.PSA is a member of the kallikrein-related peptidase family and is secreted by the epithelial cells of the prostate gland in men and the paraurethral glands in women.
The 4Kscore combines total, free and intact PSA together with human kallikrein 2. [46] It is used to try to determine the risk of a Gleason score greater than 6. [46] The Prostate Health Index (PHI) is a PSA-based blood test for early prostate cancer screening. It may be used to determine when a biopsy is needed.
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PSA levels between 4 and 10 suggest you could have about a 25 percent chance of prostate cancer, and levels over 10 signal that your chance of having the cancer is more than 50 percent.
Men who have a lower percentage of free PSA are more likely to have prostate cancer. [18] Several common tests more accurately detect prostate cancer cases by also measuring subtypes of free PSA, including the Prostate Health Index (measures a fragment called −2proPSA) and 4K score (measures intact free PSA).
A reference range is usually defined as the set of values 95 percent of the normal population ... (PSA) 40–49 years: 1.2–2.9 [75 ... free (not protein bound) 0.5
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