Hi Firefox,
Back in 2012, my PSA was all over the place following a UTI and I was referred to urology. I had the usual flow tests and DRE etc but no scan.
It dragged on for several months before I was discharged back to my GP with a letter stating that I should continue with regular PSA tests. In my case, the regular PSA testing didn't happen, and as my urinary problems went away, I didn't chase it up.
Roll on 2019 and another bout of UTI's ultimately led me back to urology and my cancer diagnosis.
I think in my case, ups and downs in PSA were driven primarily by infections and it would be pure speculation if it were cancer back in 2012.
I would say that what ever happens, regular PSA testing is the way forward even if it means pushing a bit.
Hope this helps.
Kev.