It's possible that the +/- 0.015 variation you see in your numbers is within
the margin of error for the test.  It's also possible that the surgeon (you
had a RP, right?) missed a sliver of benign prostate, and the numbers will
float around 0.055 for years to come.  

If you have a trend of 3 rises in PSA, that's when you start worrying.  but
you're not there yet.  Ask your doc about the lab, and in particular about
the precision of the test (0.06 +/- ???).  

--charlie

At the extreme ends, what is involved is a difference of 3 millionths of
a gram per thousandth of a liter.

I believe that this is well within the scope of inherent lab variables
such as calibration of the lab equipment and differences between batches
of reagents.

Or, as a good and knowledgeable friend puts it, it's "caca de mosca."
Fly specks.

Relax.

Regards,

Steve J

Let us review....

You had surgery in 2003 and discovered failure in 2004.  You had radiation
at the beginning of 2005.  For the next 2½ years, your PSA has been wavering
at a level undetectable by a standards assay.  Due to the vagaries of
prostate cancer, I would be ignorant or insane to call you cured, but you
are as cured as anyone is 2½ years after SRT.

Congratulations.

Bill

After my SRT, the rad told me (subject to all the usual qualifications
and caveats) that I could reasonably hope for a nadir of about 0.04 if
the treatment was successful, and that the PSA level thereafter would
likely bounce around, but stay at a reasonably low level.

Seems to me you're right in line with his comments!

Fred