Prostate Specific Antigen (PSA)

This laboratory investigation measures Prostate Specific Antigen (PSA) in a blood specimen to support assessment of the relevant biochemical, physiological, or clinical concern. The result may help the clinician investigate symptoms, assess a baseline, or monitor a condition or treatment, depending on why the test was ordered. It should not be used alone to make a diagnosis. Interpretation depends on the patient’s history, examination, medicines, and other test findings. Discuss the findings with the clinician who requested the test.