My understanding is that 0.1 is the lowest level that can be measured
and less than 0.1 is the statistical equivalent of zero.

The first PSA you want to see is < 0.1 (less than 1/10th of a nanogram).
For assays that are not ultra-sensitive, that is considered "virtually
undetectable".  You're doing well!

It would be a very good idea for you to start researching.  Dr. Patrick
Walsh's Guide to Surviving Prostate Cancer and Dr. Peter Scardino's Prostate
Book are good places to start.  www.phoenix5.org is a good website.  All
these will give you a fundamental understanding and expectations.  Then you
can go on to bigger and better research.  This is a lifelong and
life-altering disease and you are best able to handle it if you're prepared.

Welcome to the family.

There are other organs in addition to the prostate that produce very
small amounts of PSA, so PSA will never be "0"; even women have
measurable PSA's.  Did someone call you on the phone and tell you your
results or did you receive a copy of the test results?  If the latter,
is there a "<" (less than) symbol by the zero as in "<0.1", and what
test does the report say was used?  The standard test cannot read
accurately below 0.1 ng/ml of PSA, so the "<0.1" is the best result
(considered undetectable) you can achieve with this test.  As others
have mentioned the ultrasensitive test can read lower (<0.04, <0.01 and
<0.003, depending on the test and the lab).  If the result was reported
as "0.1" this would mean that some PSA was actually detected.  But even
in this case, sometimes the lab will make an error on the report by
ommitting the "<" symbol...Best wishes and good health, ron

The surgeon could also have left some benign prostate tissue behind.
This could result in the production of a small but detectable PSA
level of 0.1.  My own PSA has been 0.1 or 0.2 over a three year period
following RP.

Dennis