I guess I might as well throw in my two cents. My internal medicine doc strongly believes in the PSA test and included it in every annual physical exam.
Over a period of about half a dozen years, there was a steady rise. When it passed 4.0, he told me to see a urologist. I did not.
When it went past 5.0, he said I really should see a urologist. I did not.
After all, cancer couldn't possibly intrude into my life. I felt I was immune.
When it went past 6.0, he was adamant. I needed to see a urologist for a DRE and possible biopsy. Finally, because of the reading over 6 and having seen two funerals for guys younger than myself who had died from prostate cancer, I agreed to see the uro, and the rest is history.
Fact: I would have never had the DRE or biopsy by the uro without the PSA test results. As you can see in my "signature," I turned out to be a Gleason 7, with a palpable tumor.
The PSA test is not perfect, but it's better than ignorance, and the results can motivate a guy to investigate further. Just three weeks ago, I saw my internist and thanked him for insisting on the PSA test. I feel as if he saved my life, and that may not be an exaggeration.