During my TRUS biopsy my Uro commented that I had some "prostate calcification" which he said was completely normal. I am wondering if calcification could explain the blood in semen prior to biopsy that some have reported.
Years ago I was diagnosed with hematuria (blood in urine, but not visibly detected) and sent off to a Uro. He did all sorts of tests and sent me off for an IVP. During the procedure, I said to the tech "I know you are not allowed to make a diagnosis, but why do you think I have hematuria?" She said that some people have tiny uric acid crystals in their kidneys, large ones cause stones and gout, that abrade the tissues which then leak a bit of blood. Don't tell the radiologist I told you that 😉"
Anyway, my Uro finally gave up and labeled it "idiopathic hematuria" which is what they call something when they don't know what is causing it.
So maybe those calcium crystals are causing some blood to show up in the absence of any other factor.