Second PSA after recent protectectomy

Been on pins and needles since robotic surgery with respect to post op PSA. Thought I'd see what the knowledgeable folks here might know and advise.
3 mo. PSA <.1 Scale(0.0-4.0)
6 mo. PSA 0.1 same test same lab.
Lab notes say test is Siemens/Bayer method for post prostectomy patients

My GP says this .1 is the lowest detectable. He will be discussing this with my Urol and a Rad onc. in the next few days. My question is how significant a rise is this. Is this already a pattern or is it too short a period of time/ numbers to be reliably indicative of anything. I read on here all the time about rising PSA anxiety. Now I know. The rad onc said even before this 2nd PSA he wanted to do radiation, something I at this point would like to avoid as I continue to heal slowly from my Nov. 09 prost and would like nothing better than to heal and return to some type of normalcy. Will this give him enough ammunition to push his case? My understanding is rad at this point is still an unproven procedure.

Advice and thoughts from this forum have been very helpful to me thus far, and I look forward to your feedback

Teacher:
Your psa results are quite good. It reads like your surgeon did the best anyone could. Have a glass or an entire bottle.
The extension is a concern and any G 4 is always a cause for vigilance. I think that yourGP/ surgeon/urologist means that any psa recorded at less than 0.1 is undetectable in the sense that no change of treatment would be considered. If the psa can be detected by some other assay at a lower level, but the changes within this lower range would be ignored for medical purposes, then that is the same as undetectable. Was it 0.093 before (hypothetically)? If so, has this change become relevant? I think this is the issue the doctors are considering.
The wait on radiation is wise. The ability to regain all functions before any radiation will have long term reward. You might consider vitamin D3 supplementation, diet changes and other nutriceuticals for the time being until this is sorted out. It is likely that this anxiety and concern will be a long term issue. Wrap your mid around that first and then you can successfully accept the challenge of the future.
SWOG 8794 was a long term trial for men such as yourself. You can google it and the Journal of AMA is free reading. There has been a more recent update. The results are strongly positive for adjuvant radiation for men such as yourself. This was a top notch, first class trial. Results with more modern radiation by the best radiologists would likely be better than the results from the trial in the 1990's.

Englishteacher,
Your concerns illustrate why I am a fan of ultrasensitive testing. Your G.P. is not correct in stating that 0.1 is the lowest detectable PSA. Currently the lowest limit of detection is 0.003 but a result at this infitesimal level can be variable, even when done on the same sample. I elected to go with the ultrasensitive testing because of (1) 1st post op pathology said 4+4=8 and a 2nd post op opinion said 3+4=7 and (2) both said an EPE present and a substantial volume of tumour within the gland. My reading led me to believe that ultrasensitive testing can give a much earlier (up to 2 years) indication of any changes that may be happening so far as recurrence is concerned. It also gave me an absolute baseline (nadir) reading to go on. What I mean by this is, a result of <0.1 could mean anything from 0.003 to 0.099. A steady climb from say .008 to .02 to .04 to.07 to me clearly indicates a recurrence is underway and a next step (whether to radiate or not) could be planned somewhat earlier.
So far as your results are concerned there may have been no change at all. The earlier test may well have been 0.099 giving a reported result of <0.1 and now the latest test says 0.1 which is really not a change at all. Somebody may even have left out the < sign on this test.......... it would not be an unusual occurence with PSA reporting. I would go with what the other members have suggested and get another test in a month or so ........ you could even have them order an ultrasensitive result so you have a true baseline to work from.
Bill