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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».
Prostate-specific antigen (PSA) is a protein produced exclusively by prostate cells. There is a simple blood test to measure your PSA level and this may help to detect early prostate cancer.The chance of having prostate cancer goes up as your PSA level increases (see table below).hirteen per cent of men over 55 have a PSA level of â¥ 4 ng/ml but this does not automatically mean you have cancer. An elevated level can also be due to other conditions, such as benign enlargement of the prostate (BPH), a urinary tract infection or a prostate infection.