Dutch-ESS here - these PSA tests are just as hard on us as the guys aren't they? My husband had proton and we were told that with radiation the PSA would tend, in most cases, to go down slowly to what they wanted to see as a nadir of under 0.5. We were warned that there could be some upward bounces - he has not experienced this, but have many friends who have had this happen. Think one bounce in itself, while very scary, doesn't mean alot - should it occur a second time would be more alarming. We were to have his PSA checked every 6 mos, but think if this had happened to him, we would have it done again in 3 mos.
Did you use the same lab as they also can vary? We will keep you in our thoughts.
After submitting this I had another thought - checked your well done JustJulie thread and did not find what your husband's original PSA was. Is it possible that the first PSA he had done after brachy that came back as 0.67 could have been wrong, which means you would be using an incorrect point from which to gauge further testing? I was under the impression that it took some time for the seeds to begin to build up radiation in the prostate, so the drops might not be too drastic at first. Just a thought. Think a deep breath and a hot cup of tea might be in order right now. It is surprising how these old buggers grow on us isn't it?? Hang in there