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The prostate-specific antigen (PSA) test is a blood screen for prostate cancer.
The PSA (prostate specific antigen) is a test that is done to help diagnose the cause of an enlarged prostate. The blood test can't tell you the size of the prostate per se.
It is a blood test. Not a semen test.
There is no blood test that can act as a true/false for prostate cancer, but PSA (prostate specific antigen) can be measured to screen for it.
The full form of the PSA blood test is Prostate-Specific Antigen.