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What is a normal PSA level?

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Updated July 01, 2014

Question: What is a normal PSA level?
The prostate gland produces a substance called PSA, or prostate specific antigen. A small amount of PSA can be found in blood, but it is mostly present in semen. A blood test is done to measure the amount of PSA.
Answer: PSA is measured by nanograms per millimeter of blood. Most men have under 4 nanograms. Anything higher can indicate prostate cancer. According to the American Cancer Society, a PSA level between 4 and 10, indicates a 25% chance of it being related to prostate cancer. A PSA level higher than 10, increases the likelihood of having prostate cancer to 50% or more.

There are several factors that can also elevate PSA levels, such as:

  • ejaculation (no ejaculation at least two days prior to test)

  • PSA levels can naturally increase with age

  • inflammation of the prostate gland

  • non cancerous enlargement of the prostate


  • Also take into consideration that certain medications and herbal supplements can falsely lower your PSA level. It is important to let your physician know what medications, vitamins, and supplements you are taking before having the test.
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    7. What Is a Normal PSA Level? - Prostate Cancer FAQ

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