What Is a Normal PSA?


Quick Answer

According to the National Cancer Institute, a normal prostate-specific antigen result is generally considered to be below 4 nanograms per milliliter. Doctors often recommend a prostate biopsy for men with higher PSA levels to determine whether prostate cancer is present.

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Full Answer

Recent research cited by the National Cancer Institute suggests that PSA levels may rise if the patient has prostatitis or a urinary tract infection, and a prostate biopsy or surgery can also elevate the PSA level. Certain drugs, including finasteride and dutasteride, can artificially lower PSA. In general, however, higher PSA levels correlate with a higher likelihood of prostate cancer. Also, a continuous rise in PSA over time may also be a sign of prostate cancer.

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