Prostate-specific antigen (PSA) is a protein made by the prostate gland. The prostate is a walnut-sized gland in men, located near the bladder and rectum. It produces a fluid that is part of semen. Most PSA is released into semen, but some is released into the bloodstream. If there is a problem with the prostate, the PSA found in the blood can become elevated.
The PSA test is used to:
You will roll up your sleeve. An elastic band will be wrapped around your upper arm. An area on your arm will be cleaned with alcohol. The needle will then be inserted into your arm. A small amount of blood will be drawn into a tube. The needle will be removed. Pressure will be applied to the puncture site. A small bandage may be placed on the site. Your blood will be sent to a lab for testing.
You will be able to leave after the test is done.
Drawing blood takes only a few minutes.
It may be uncomfortable when the needle pierces your skin.
The results are usually available in a few days to a week. Your doctor will talk to you about your results.
If your PSA level is slightly elevated but there are no other reasons to suspect prostate cancer, your doctor may recommend closely following your PSA levels. If your PSA level continues to rise or the doctor notices a lump during a digital rectal exam, he will probably schedule other tests, such as a prostate biopsy.
American Cancer Society
American Urological Association Foundation
Canadian Cancer Society
Canadian Prostate Cancer Network
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Cancer facts: questions and answers about the prostate-specific antigen (PSA) test. National Cancer Institute website. Available at: http://www.cancer.gov/cancertopics/factsheet/Detection/PSA . Updated March 2009. Accessed October 25, 2007.
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Prostate cancer. Mayo Clinic website. Available at: http://www.mayoclinic.com/health/prostate-cancer/DS00043 . Updated June 2009. Accessed July 22, 2009.
Stephan C, Stroebel G, Heinau M, et al. The ratio of prostate-specific antigen (PSA) to prostate volume (PSA density) as a parameter to improve the detection of prostate carcinoma in PSA values in the range of < 4 ng/mL. Cancer . 2005;104:993-1003.
Thompson IM, Ankerst DP, Chi C, et al. Operating characteristics of prostate-specific antigen in men with an initial PSA level of 3.0 ng/ml or lower. JAMA . 2005;294:66.
¹5/6/2009 DynaMed's Systematic Literature Surveillance http://www.ebscohost.com/dynamed/what.php : Schröder FH, Hugosson J, Roobol MJ, et al. Screening and prostate-cancer mortality in a randomized European study. N Engl J Med. 2009;360:1320-1328.
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