Tom, you have earned an UN-radiated turkey. With your recent readings of 0.027, .022, .028, 0.024, 0.027, 0.026, 0.029, 0.029, 0.030,
your PSA is stabile. The Labcorp uPSA test, as an example, can vary ±0.002 when the same blood sample is repeatedly tested. In addition the non-prostatic (healthy) tissues that produce minutes amount of PSA undoubtedly fluctuate in what they put out. Then there is equipment calibration and other sundry factors. (Notice the dip to 0.022 you had followed by 0028; it's the trend we watch.)
One study showed that a PSA of 0.030 or lower 2 years after surgery is a good prognosticator--you are that low after many more years.
Your PSA could reach 0.20--the official PSA for biochemical recurrence in a decade--or never. We have more sensitive tests, but the 0.20 definition has not been changed. Also, PSA can rise and then plateau. Folks with more serious situations after surgery may start salvage treatment at, say, 0.10, but I think your PSA is
much too low for salvage therapy. But remember, we are not doctors.
See you next year
Djin