Prostate-specific antigen. A substance produced by the prostate that may be found in an increased amount in the blood of men who have prostate cancer, benign prostatic hyperplasia, or infection or inflammation of the prostate.

GoldBamboo

... Why get tested?
To screen asymptomatic and symptomatic men for prostate cancer, to help determine the necessity for a biopsy of the prostate, to monitor the effectiveness of treatment for prostate cancer, and to detect recurrence of prostate cancer

When to get tested?
The frequency of PSA testing is an individual decision that should be determined through discussion with your physician. There is continued debate among experts and national organizations over when and how often to order the PSA test to screen asymptomatic men. (For specific details, see prostate cancer screening for adults and adults 50 and up). PSA testing may be performed when a man has symptoms suggestive of prostate cancer such as difficult, painful, and/or frequent urination. It may also be ordered during and at regular intervals after prostate cancer treatment.

Sample required?
A blood sample drawn from a vein in the arm
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Lab Tests Online - more...

PSA is a three letter acronym which may stand for: Pacific Sociological Ass ...
Wikipedia - [full article]

Resources

  • PSA (Lab Tests Online)