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Abnormal levels of PSA, or prostate-specific antigen, generally do not exist, states the National Cancer Institute. Historically, PSA levels above 4.0 nanograms per milliliter often required a prostate biopsy to test for cancer, but studies show that prostate cancer can exist in patients with PSA le


There is no specific normal or abnormal level of PSA in the blood, according to the National Cancer Institute. In general, the higher a man's PSA level, the more likely it is that he has prostate cancer.


Prostate-specific antigen (PSA) levels above 10 are considered high, according to WebMD. PSA levels are used to determine prostate cancer risk; readings greater than 10 may indicate up to a 67 percent chance of contracting prostate cancer or another prostate condition, cites WebMD.


A good, or normal, prostate-specific antigen score is 4.0 nanograms per milliliter and lower, according to the National Cancer Institute. PSA levels above this amount may be indicative of potential prostate cancer.


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.


Anything that stimulates a man's prostate affects prostate-specific antigen, or PSA, test results. Conditions such as prostatitis, benign prostatic hypertrophy and prostate surgery and events such as a digital prostate exam or an orgasm within the previous 24 hours potentially affect the PSA level,


A normal PSA level is considered to be 4.0 nanograms per milliliter of blood. Doctors often recommend a prostate biopsy to determine whether prostate cancer is present if a man has a PSA level above 4.0 nanograms per milliliter, according to the National Cancer Institute.


Most men have a prostate-specific antigen, or PSA, level of 4 and under, according to WebMD. This is the cutoff level for most doctors when determining prostate cancer risk. Men with prostate-specific antigen levels higher than 4 are more at risk of prostate cancer, though any man may develop it.


The PSA level shows the amount of the prostate-specific antigen protein in a man's blood, according to the National Cancer Institute. PSA is manufactured by the prostate gland. High levels on a PSA blood test sometimes indicate prostate cancer.


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.