The PSA Ultrasensitive Test measures the level of Prostate Specific Antigen in the blood. PSA is a protein produced by the prostate gland. Typically, elevated PSA levels are indicative of an increased risk of having Prostate Cancer. This test is more sensitive than a regular PSA test and is able to detect PSA in smaller amounts. This test is typically used to monitor men who are receiving treatment or have had surgery for Prostate Cancer. Results for this test should be interpreted by a doctor.