Hi Peter,
I was referred to Oncology after my PSA rose from 0.08 to 0.13 over 4 months, which entailed the PSMA PET scan. I'd always been told I would be referred once it rose to 0.1 or beyond. With this in mind, the next test after 0.08 was ordered for 4 months later, rather than 6.
My Oncologist confirmed that (as you say) elsewhere, such as in some other countries and even other NHS Trusts, investigations only start once the PSA has reached 0.2 or more. But that's how my Trust does it.
Two months after the 0.13 reading, my PSA was again 0.13, after which my Oncologist said she'd rather wait with salvage treatment until it got close to 0.2. On the PSA staying the same, she said the PSA did "funny" things and was unpredictable, pointing out that at some stage, between February and July 2020, it had satyed at 0.03. But then it started rising again.
According to my clinical nurses (before being referred to Oncology), they consider any reading under 0.1 to be as "undetectable".
I was very interested to read your comment about hormone treatment halving the chances of recurrence in 7 years. I'm also more reassured about maybe not getting side effects in their worst form.
All the very best for your next test next week. We are still talking about a very low PSA level.
Best wishes,
Peter