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www.cancer.gov/types/prostate/psa-fact-sheet

Prostate-specific antigen, or PSA, is a protein produced by normal, as well as malignant, cells of the prostate gland. The PSA test measures the level of PSA in a man’s blood. For this test, a blood sample is sent to a laboratory for analysis.

www.medicinenet.com/prostate_specific_antigen/article.htm

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). PSA is released by the prostate into the semen where it acts to liquefy the semen following ejaculation.

www.webmd.com/prostate-cancer/guide/psa

The prostate specific antigen (PSA) test is used to measure blood PSA levels and help detect prostate cancer or other prostate abnormalities. Learn more about the PSA blood test at WebMD.

www.healthline.com/health/psa-levels-prostate-cancer

The prostate gland makes a protein called prostate-specific antigen, or PSA. A healthy man without prostate cancer should have a small amount of PSA circulating in his blood.

prostatecancerfree.org/prostate-specific-antigen-psa

Prostate Specific Antigen or PSA, is an enzyme found in a man's blood produced exclusively by prostate cells.Normal PSA levels in the blood are very small amounts between 0-2.5 ng/ml. As men age, normal levels can increase slightly.

en.wikipedia.org/wiki/Prostate-specific_antigen

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.

my.clevelandclinic.org/.../15282-elevated-psa-prostate-specific-antigen-level

Prostate-specific antigen (PSA) is a protein produced by the prostate gland. Blood levels of PSA can be elevated in men with prostate cancer. For this reason, measurement of PSA in the blood has been used as a screening test for prostate cancer.

www.menshormonalhealth.com/psa-test-results.html

PSA aka Prostate Specific Antigen is a protein enzyme produced in the prostate gland and released in to the blood stream.. After blood work analysis, the resulting PSA score shows how much of the enzyme you're producing, and your probability of being diagnosed with prostate cancer.

www.ncbi.nlm.nih.gov/pmc/articles/PMC4548626

Prostate-specific antigen (PSA) is a glycoprotein secreted from prostatic acini, and it is firstly defined in the year 1979. [] US Food and Drug Association (FDA) approved PSA as an auxillary diagnostic test in the management of the patients diagnosed as prostate cancer (PCa). [] It was introduced into clinical practice in 1987 as a diagnostic marker. []

www.mayoclinic.org/tests-procedures/psa-test/about/pac-20384731

The PSA test is a blood test used primarily to screen for prostate cancer.. The test measures the amount of prostate-specific antigen (PSA) in your blood. PSA is a protein produced by both cancerous and noncancerous tissue in the prostate, a small gland that sits below the bladder in men.