It came back again at a .1. Isn't it supposed to be zero at this point?????
I understand your high level of worry. You might have seen in other posts at this site about the "zero club", and lots of talk about "zeros." Naturally, when your dad's PSA result was not "zero" at a time when you thought it, too, should be reported at "zero"...then this has caused you great anxiety. Very understandable.
Here's what you probably didn't know...there is no such thing as a "zero" PSA in a living, breathing man.
The concept of the "zero club" is a misnomer that has been adopted here, and unfortunately every couple of weeks someone else (like you) gets—lets just use the words you've already used: "very worried"—about not being at "zero." The "zero club" here has meant a low level, or an undetectible level (below the detection limits of the test), depending on who you might ask.
So, let's talk about your dad's PSA result. First thing to be very keen on (because they are easy to mix up) is the decimal places. A PSA test reported as 0.1 ng/mL could mean something very different from a result reported as 0.10 ng/mL, even though mathematically they are the same. The first implies that it was measured with a "standard" PSA test which has a lower detection limit of 0.1 ng/mL; whereas the second result implies it was measured with a "ultra-sensitive" PSA test which has a lower detection limit of 0.04 or 0.01 ng/mL (typically one of these two, although other versions are also available). If it was the "standard" test, it might have actually been reported the way that they report the lowest possible result, which is "<0.1 ng/mL", meaning "less than 0.1." Did your dad's actual result have a "<" (less than) sign in front of it?
You reported the result as ".1", but use of the "ultra-sensitive" PSA test for someone on HT is much more common because the doctor would want to track closely the lowest point (nadir), and so this indicates to me that there might be a decimal point issue here.
Double check the actual written results of the test.
I hope this provides some helpful information...
[edit: the two "0's" in red, above, were added later in an edit/correction]
Post Edited (Casey59) : 5/20/2010 7:54:49 AM (GMT-6)