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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.


There isn't a prostate-specific antigen level that is considered normal or abnormal, explains the National Cancer Institute. Generally, higher PSA levels increase the likelihood of prostate cancer, or if PSA results rise continuously over time, the risk for cancer also increases.


According to WebMD, PSA stands for prostate-specific antigen, a substance produced by the prostate gland. High levels suggest a risk of prostate cancer, and levels between 2.5 and 4 nanograms per milliliter of blood are usually considered normal.


Normal levels of total PSA, or prostate-specific antigen, increase from less than 2.0 nanograms per milliliter under age 40 to less than 7.2 nanograms per milliliter above age 80, says Mayo Clinic. If the PSA level is higher than 10 nanograms per milliliter, the risk of prostate cancer is high.


There is no level of PSA (prostate-specific antigen) in the blood that is considered normal, according to the National Cancer Institute. However, it is typical for higher levels to be indicative of prostate cancer, particularly if PSA levels continue to rise over time.


The normal prostate-specific antigen level for most men is 4 nanograms per milliliter or lower, according to WebMD. Men with PSA levels higher than 4 are considered at risk of having prostate cancer. WebMD notes that prostate cancer in men is a possibility at any PSA level.


A normal PSA blood level is 4 nanograms per milliliter of blood, according to MedlinePlus. Men younger than 50 should have levels below 2 ng/mL. Older men usually have levels above 4 ng/ML. PSA refers to a protein made by the prostate gland called prostate-specific antigen.


For most men, a normal PSA level is less than 4 nanograms per milliliter, states WebMD. Younger men should have a PSA level of 2.5 nanograms per milliliter or less. Potential causes for elevated PSA levels include prostate cancer and prostatitis, which is inflammation of the prostate.


No specific level of PSA is considered normal, as men with heightened or low levels of PSA can still have prostate cancer, according to the National Cancer Institute. Doctors have historically considered PSA levels at or below 4.0 nanograms per milliliter to be normal, but this is no longer true.


Cancer.gov indicates that there are no specific guidelines for normal PSA levels. However, most physicians consider 4.0 ng/mL as normal. In most cases, normal PSA levels indicate that there is no underlying pathology, but this can vary between cases.