PSA Test Market is poised to value over USD 3 billion by 2028 end at a CAGR of over 5.5% during the forecast period 2021 to 2028. A PSA test is a blood test used primarily for prostate cancer screening. During the test, your blood is checked for prostate-specific antigen (PSA). A protein called PSA is made by both cancerous and noncancerous cells in the prostate, a small gland lying below the bladder in men. It can also be found in the prostate, as it is mostly found in semen.