Prostate-Specific Antigen (PSA) Test Test
A PSA test measures the level of prostate-specific antigen in your blood. High levels may be a sign of prostate cancer or other prostate conditions, but the test cannot diagnose cancer by itself.
What this test measures
A prostate-specific antigen (PSA) test is a blood test that measures the level of PSA in a sample of your blood. PSA is a protein made by your prostate.
What your results mean
Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.
Higher-than-normal results
High PSA levels can mean you have prostate cancer or a prostate condition that's not cancer, such as an infection (causing prostatitis) or an enlarged prostate.
Frequently asked questions
What does a PSA test measure?
It measures the level of prostate-specific antigen (PSA) in your blood. PSA is a protein made by your prostate.
Can a PSA test diagnose prostate cancer?
No, a PSA test cannot diagnose cancer. If your level is high, you may need other tests, such as a prostate biopsy, to find out if you have cancer.
What can cause a high PSA level besides cancer?
High PSA can be caused by an enlarged prostate (BPH), prostatitis (inflammation of the prostate), urinary tract infections, or certain medicines.
What are the possible harms of PSA screening?
PSA screening may lead to finding and treating prostate cancer that would never have affected your health. Treatment can cause serious harms like erectile dysfunction, urinary incontinence, or bowel incontinence.
Should I get a PSA test?
Talk with your health care provider about your risk for serious prostate cancer, your general health, and your preferences to decide if PSA testing is right for you.
Related lab tests
Sources
- MedlinePlus: Prostate-Specific Antigen (PSA) Test — NIH MedlinePlus
Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.