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prostate-specific antigen (psa) test

prostate-specific antigen (psa) is a substance released into the blood by the prostate, which is part of the male reproductive system. a psa test measures the amount of prostate-specific antigen in the blood.

low amounts of psa may be found in the blood of healthy people. the amount of psa in the blood normally increases as the prostate enlarges with age. it is also increased by ejaculation, by inflammation of the prostate gland (prostatitis), and by prostate cancer.

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this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use and privacy policy. to learn more about healthwise, visit healthwise.org. © 1995-2022 healthwise, incorporated. healthwise, healthwise for every health decision, and the healthwise logo are trademarks of healthwise, incorporated.

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