Thanks for your input Lyn ......
A certain member , like your John , has had a very slow post op PSA rise from 0.06 to 0.09 and has been told to wait until 0.1 or above and then he will get a PSAX scan only available in two centres which exceeds PET capability , especially at low psa values.
I simply looked up PSAX and that was all I could find thank you very much ....