PSA (Prostate Specific Antigen)
Also Known As: Prostate Blood Test, Free PSA, Total PSA
Prostate specific antigen (PSA) is a type of protein produced by cells in the prostate. The prostate is a small reproductive gland that helps make semen, the fluid that transports sperm from the testicles through the penis during ejaculation. Healthy prostates create low levels of PSA. An elevated level of PSA may indicate a problem with the prostate.
The PSA test uses a blood sample to measure your PSA level. In some patients, the PSA test may be used for prostate cancer screening. The PSA test also helps diagnose prostate cancer and noncancerous prostate disease and monitor if you have been diagnosed with these conditions.