I hope I can shed some light on things for you.

My brief lead up to explaining things to you:
1. PSA of 2.46 in 12/2008 and biopsy showed Gleason 8. Had radical prostectormy
2. 6 months after surgery PSA was >.05 which means it not be detected (GOOD news)
3. 3 years later it began to creep up to about 1.0 and 40 radiaitons sessions were instituted.
4. PSA 3 months later was again >.05 ( so was feeling great and felt I was "cured"
5. SIX years later 2017 my (QUARTERLY) testing showed that it was creeping up very slowly by about .02 every two months and in the fall of 2017 I had an MRI which showed NO detectable cancer cells.
6. We continued to monitor my PSA every six months and watched as it continued to VERY slowly go up---meaning that there was something growing but we still did not know where. (Prostate cancer generally goes to boney areas)
7. November 2021 a Petscan (where a dye specific for prostate cancer cells is injected and the body from neck to mid-thigh is scanned) failed to show any detectiable areas, BUT we agreed to continue to watch it. This was done when my PSA was .60.
8. In February 2022 PSA had gone to .94
9. Retest in May 2022 was .92 (yes it had gone DOWN)
10. PSA test in Sept 2022 showed it at 1.24 (up again)
11. December 2022 it was 1.94 (double the Feb 2022 test ) and another PETSccan was ordered for first week of Jan 2023.
12 Petscan showed small spot in lung, larger spot on verterbrae, and one on a rib.
13. Was started on 6 month injections of Eligard
14. At same time three sessions of SBRT were scheduled over a 5 day period
15. Was referred to a hematologist/oncologist who has found that best way to attack any minute existing cells and to any possible future spread of the cancer to cells is to add a drug to block tertosterone from reception sites on minute cancer cells --- thus with the Eligard "starving" the cancer cells that (at this point) cannot be found.. I shall begin on that drug within the next few days.

Hope this helps. YES if it is going up you should be getting check more than once a year....as I said, as soon as we saw changes I went to 3 month testing