@melvinw
Different labs get different results. One thing people are told is to only go to the same lab if they’re getting PSA test that way they are consistent.

Either one of your tests are real good. You are under radiation treatment, It doesn’t kill the cancer cells immediately. It leaves him in a state where they die, but it can take a while. That state also prevents them from spreading or growing, They just die. You will see your PSA slowly drop, though it can be quick too.

In my case, my PSA went up to .2 so I had salvage radiation for around 9 weeks. Three months later, my PSA was undetectable < .1.