thanks for your comment. I want to make sure I understand what you are asking, was your level from your PSA test 2.1? And if so, are you wondering why the doctor ordered a PET scan? The reason I included a link about PSA levels was because I assumed you got a PSA test and it was high enough that the doctor ordered a PET scan. The article talks about an how an elevated PSA doesn’t mean you have cancer, and a low PSA doesn’t mean you don't, so the PSA test by itself cannot detect prostate cancer. The PSMA PET scan has helped to identify whether prostate cancer has spread or returned. I wish you had more energy, has this been going on for a while? Jill, prostatecancer.net team