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Prostate-Specific Antigen (PSA) Test - National Cancer ...
What is the PSA test? Prostate-specific antigen, or PSA, is a protein produced by normal, as well as malignant, cells of the prostate gland. The PSA test measures the level of PSA in a man’s blood. For this test, a blood sample is sent to a laboratory for analysis. The results are usually reported ...
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