A PSA value of 0.129 is way too low for a Ga68-PSMA PET/MRI.
I agree. I have no idea why my urologist's team ordered the Ga68 PET/MRI before they would refer me to an RO. The Ga68 test delayed this referral by several months. All told, it took UCSF 11 months to begin SRT after the first reappearance of PSA (.031) in February 2016. I understand that some practitioners would have begun radiation earlier. I don't know whether waiting for a PSA of .2 is standard operating procedure at UCSF, but that's how it turned out for me.
In my case, the SRT was directed to the prostate bed only. My RO did not think the side effects worth the risk of side effects. He said there had been no randomized trial that had shown a benefit to lymph node radiation in the post operative setting. The lymph nodes are right up against the bowel so chances of side effects are much higher than with SRT to the prostate bed alone.