Prostate Cancer Worried about your prostate Screening? If you are over 50, you can ask your doctor for a PSA test. PSA screening is not recommended by authorities in the UK or the US. It has not been proven that the benefits outweigh the risks. PSA is not a good diagnostic test, but it is the best we have. Above a level of 10 ng/ml, the PSA test is better at diagnosing prostate cancer. If you have a PSA test, there are lots of things to think about, including: About 15% of men diagnosed with prostate cancer are not identified by the test. About 75% of men with raised PSA levels between 4 and 10 ng/ml do not have cancer. All these men with raised PSA levels will require a biopsy to rule out prostate cancer. PSA screening will diagnose some men with advanced prostate cancer. For about 80% of men diagnosed with prostate cancer as a result of PSA screening: The cancer will not affect their survival. They will have to live with the psychological consequences of prostate cancer. They may want treatment, affecting their potency and continence. PSA screening may not increase the survival of men with advanced prostate cancer. PSA stands for "prostate-specific antigen", but for many men it "promotes stress and anxiety".