February 7, 2016
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PSA Test
(Prostate Specific Antigen)

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Prostate specific antigen (PSA) test facts

  • The PSA test is a blood test.
  • The PSA test can be used to suggest the presence of prostate cancer, to monitor its treatment, or assess its recurrence.
  • The PSA test can also be abnormal with benign enlargement (benign prostatic hyperplasia or BPH), inflammation (prostatis), and infection of the prostate gland.

What is prostate specific antigen (PSA)?

Prostate specific antigen (PSA) is a substance produced exclusively by certain cells within the male prostate gland. Biochemically, it belongs to the protease family of kallikrein and is also known as human kallikrein 3 (hK3). PSA is secreted by the prostate in the semen where its role is to liquefy the semen following ejaculation. Most of the PSA produced by the prostate gland is carried out of the body in semen, but a very small amount escapes into the blood stream, so PSA is normally found in low amounts (nanograms per milliliter or ng/mL) in the blood.

If the PSA level is high for your age or is steadily increasing (with or without an abnormal physical exam), further investigation, namely a prostate biopsy, may be recommended. The doctor should consider other risk factors of prostate cancer such as family history, prostate volume, the presence of benign prostatic hyperplasia (BPH), urinary symptoms, rectal exam findings, and ethnicity before recommending the biopsy. At this time, prostate biopsy for pathology review is the only way to determine if prostate cancer or other abnormal cells are present in the prostate.

How is PSA test measured?

PSA is measured by a simple blood test that does not require fasting or special preparation. Since the amount of PSA in the blood is very low, detection of it requires a very sensitive type of technology (monoclonal antibody technique). The PSA protein can exist in the blood by itself (known as free PSA), or bound with other substances (known as bound or complexed PSA). PSA is mostly bound to three substances: alpha-2-macroglobulin, alpha 1-antichymotrypsin (ACT), and albumin. Total PSA is the sum of the free and the bound forms. The total PSA is what is measured with the standard PSA test.

Medically Reviewed by a Doctor on 1/14/2016

Source: MedicineNet.com
http://www.medicinenet.com/prostate_specific_antigen/article.htm

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