A gradual increase in PSA as we age is expected.  I have read that  0.1
or 0.2 per year can be normal.   It's the accelerated-increase that is
a concern; a problem that you don't seem to have.
 Bob

From: moo@noway.prudigy.net (MZB)

I am 60 years old. I was surprised by a recent PSA uptick at my annual
physical exam.
The data is below. I might add my doctor is not at all concerned. Any
thoughts? (Note that this last one was in 7/06, about 1.5 years after
the previous one)
7/06 2.67
2-05 2.2
3-04 2.15
2-03 2.0
11-01 2.1
10-00 2
10-99 1.7
10-98 1.6
10-97 1.5
10-96 1.3
6-95 1.2
======
you are lucky to have such a long tracking history.

while a psa rise is common as males age, there are two things that could
help relieve some your concerns.

1. take a two week course of cipro or levaquin and retake the psa test
to see where the psa number is.  this would reduce the chance of number
change due to prostatitis.

2. take a free psa test or psa II test.  this number should be higher
than 28.  

as the individual develops prostate cancer.  this number will drop below
15 as the psa start to climb.  

there is no one particular test that i can think of that will give you a
quick answer to what you are asking, but rather several tests as well as
the DRE and then all the information gathered gives you a better idea of
what's going on.

hope this helps.

~ curtis

knowledge is power - growing old is mandatory - growing wise is optional    
"Many more men die with prostate cancer than of it. Growing old is
invariably fatal. Prostate cancer is only sometimes so."
http://community.webtv.net/PALMER_ENT/doc