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From Phoenix5's Prostate Cancer Glossary
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protein specific antigen

Abbreviations: PSA

Definition: A complex protein made by the prostate gland in response to the presence of foreign materials. It is measured via a blood sample to help detect potential problems in the prostate gland. PSA exists in two forms in the blood, either bound to protein or unbound (''free,' also known as PSA II'). As with cholesterol testing, scientists have found it meaningful to measure these different forms for better risk predictions.

For more information: See antigen, protein, prostate gland, For a longer explanation, see essays on PSA at Phoenix5.


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Definitions are provided for education only and are not medical advice. Created exclusively for Phoenix5. © 2002 Phoenix5.