Welcome to HW.
My thought: Prostatitis
Prostatitis often leads to large swings of PSA, it can be difficult to treat and often reoccurs. Don't know about
the effect of a vasectomy, but if there was any infection or inflammation from that it might affect PSA. Blood in your semen is likely related and very likely the cause of the PSA rise.
Next, the PSA isn't a test for cancer. It's more of an "Engine check light" kind of thing. High PSA just means you need more tests to see what's wrong. Things that can raise PSA include, BPH (enlarged prostate), prostatitis (infection), sex before the test, bike riding, a bad day at the lab ... PC is the last thing on the list. PSA due to PC tends to climb slowly and never falls. and PC rarely has symptoms in the early stages.
What you have is a reason to get regular PSA tests and perhaps one or two other tests. The PHI (prostate health index) is a good one. The other question is, do you have any family members who've had PC - that would put you in a higher risk group.
In you're place, I'd just add PSA to my annual list of things to get checked, and go enjoy life.
If it ever started climbing again, you'd go back to the URO for another checkup.
I'll be in the shop.
Age 57, 52 at DX
4.2 10/11, 1.9 6/12, 1.2 12/12, 1.0 5/13, .6 11/13,
.7 5/14, .5 10/14, .5 4/15, .3 10/15, .3 4/16, .4 10/16, .4 5/17, .3 10/17
2 out of 14 cores positive
Treatment IGRT - 2/2012My latest blog post