Prostate Specific Antigen (PSA)
Prostate-Specific Antigen (PSA) is a protein made in the prostate gland. The PSA, Total test measures the amount of PSA in the blood.
PSA is either bound or unbound (free) in the blood. Bound PSA is attached to other proteins; free PSA is not attached to other proteins.
Elevated PSA levels may be found in conditions such as benign prostatic hyperplasia, prostatitis, prostate cancer, and others. PSA may also be elevated due to certain medications or urologic procedures.
The PSA test is not diagnostic of cancer, and PSA test results should be followed up by a healthcare provider.