Prostate specific antigen or psa is a protein produced by normal as well as malignant cells of the prostate glandthe psa test measures the level of psa in a mans blood for this test a blood sample is sent to a laboratory for analysis. Prostate specific antigen psa is a substance produced by the prostate glandelevated psa levels may indicate prostate cancer a noncancerous condition such as prostatitis or an enlarged . Prostate specific antigen psa also known as gamma seminoprotein or kallikrein 3 klk3 is a glycoprotein enzyme encoded in humans by the klk3 gene psa is a member of the kallikrein related peptidase family and is secreted by the epithelial cells of the prostate gland. Prostate specific antigen psa is a substance produced only 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. Prostate specific antigen or psa is an enzyme found in a mans blood produced exclusively by prostate cellsnormal psa levels in the blood are very small amounts between 0 25 ng ml as men age normal levels can increase slightly
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