In John's boots, I'd probably get the test 6 monthly. Only because if there is a change I might see a trend a bit faster. The downside to 6 monthly is you think about it a bit more (I would anyway).
you're welcome. that gets better as each year passes. it used to really weigh on me especially since my PSA was a rollercoaster for the first few years. the last year I had no anxiety and also no desire to test more frequently. I think once you're 40 you should check the PSA box on annual blood work for the duration. why wouldn't you?