cancer.gov - website profile
Prostate-Specific Antigen (PSA) Test - National Cancer ...
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. ... PSA level may also vary somewhat across testing laboratories.
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