The PSA test is a blood test that measures the amount of prostate specific antigen (PSA) in your blood. It can help to diagnose prostate cancer. 

Your doctor or nurse takes a sample of your blood. This can be done at your GP practice. They then send this off to a laboratory to check the amount of PSA. 

You might have a PSA test if you:

• have symptoms that could be caused by prostate cancer
• are aged 50 and over and have asked your GP for a test

Doctors also check your PSA level as you go through prostate cancer treatment. It helps them see how well treatment is working.