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prostate specific antigen, PSA (noun). a protein manufactured exclusively by the prostate gland; PSA is produced for the ejaculate where it liquifies the semen and allows sperm cells to swim freely; elevated levels of PSA in blood serum are associated with benign prostatic hyperplasia and prostate cancer.see more on Definitions.net Â». protein manufactured exclusively by the prostate gland; PSA is produced for the ejaculate where it liquifies the semen and allows sperm cells to swim freely; elevated levels of PSA in blood serum are associated with benign prostatic hyperplasia and prostate cancer. see more on Definitions.net Â».
The PSA test stands for prostate specific antigen. An antigen is an antibody designed to protect against disease. And because we can test for a prostate specific antigen, the volume of that antigen can indicate the seriousness of any disease that is attacking the prostate.By itself, a PSA reading does not mean very much. The PSA is only a very rough indicator.It certainly does not predict prostate cancer, but it may give you an early indication. However, the PSA is very unreliable and essentially flawed as a test for prostate cancer because a raised PSA can mean many different things.nd because we can test for a prostate specific antigen, the volume of that antigen can indicate the seriousness of any disease that is attacking the prostate. By itself, a PSA reading does not mean very much. The PSA is only a very rough indicator.