PSA, or prostate-specific antigen, is a protein that is produced in the tissue of the prostate gland, located just below the bladder. It is primarily used as a screening marker for prostate cancer in males.
PSA is primarily used as a means to liquify the semen in males and plays an important role in fertility. It can be helpful to do a PSA test on a routine basis and especially if painful or frequent urination is occuring, pelvic discomfort or back pain.
Small amounts of PSA will ordinarily circulate in the blood. Although elevated levels are commonly associated with prostate cancer, higher levels of PSA can also indicate an infection or other disease in the prostate. It is important to consult with a primary care physician if elevated PSA levels are present.