It would have been helpful to mention in this article that the free-PSA-ratio test is effective only for men with a prostate volume
less than 40 cubic centimeters. The test doesn’t work for men with larger prostates. This is
because, for larger prostates, the ratio of free to total PSA is elevated to roughly the same level
in men with cancer and those with benign prostate hyperplasia but no cancer.
Log in
Subscribers, enter your e-mail address for full access to the Science News archives and digital editions.