@mjp0512
If I read you originally post right you have been on ADT since 6/7/25 which resulted in the drastically reduced PSA levels.

Your radiation treatments ended 10/27/25. You had a PSA done 2 months after radiation ended. Normally (speaking for guidance from Mayo R/O and UHFPTI R/O) they do a PSA 3 months after radiation.

Please talk to your R/Os and urologist. When your prostate goes through radiation is very traumatized and irritated. Your PSA is extremely low but I nor any others know the parameters of your lab and what is undetectable range. If you have a prostate you are going to have PSA and completely normal. It is the rising of PSA over time and time that is a concern. You should be happy about your PSA. Your PSA will bump up and down for years. My R/Os goal is for my PSA to stay below 1. I am at .12 now.

I am not familiar nor is anyone else the lab your medical providers use. In my case Mayo Jacksonville they do not post any numbers below .10 as considered undetectable. What your lab uses for undetectable should be discussed with your medical providers as none which will give you a more accurate basis for numbers given to you.

Hormone treatments starve your PC they do not kill it (per my urologist and R/Os I am not a medical professional). Radiation damages (again from my R/Os) the cells of your PC and they unlike regular prostate cells cannot repair themselves and die. Thus it takes time to get to your base PSA which can take years.

You are only 2 months from your last radiation treatment. Again I did not have a PSA done until 3 months afterward with the caveat of from my R/Os is done earlier your prostate is not a happy camper and highly irritated after being bombarded with radiation

Asked your doctor about what the lab he/she uses that signifies what is considered undetectable. How long were you told you would be on ADT?