Free and total PSA test
This blood test measures the amount of two different types of PSA. It can help tell whether you have a high PSA level because of prostate cancer, or because of an enlarged prostate. But doctors don’t yet agree on what levels of the different types of PSA show that a man has prostate cancer, so it’s not used that often. The test is only suitable if you have a PSA level between 4 and 10 ng/ml.