I start my Micro PSA's soon. This thread has been very helpful.
I feel the physician should have said "statistically insignificant."
For more meaningful interpretation, such small numbers scaled in the bottom 2% of "Low" (.04/2.5 < 2% - Thanks Kitt) should include the "variance" such a machine expereinces every time it examines the same sample.
Swim's point about a number moving up seems the most relevant.