"Undetectable" is a phrase that most doctors use with patients to show that medication is doing what it is designed to do....disrupt the HIV replication cycle and bring the level of virus in the blood down...
The "undetectable" threshold is different depending on the sensitivity of the test. It also should be noted that most HIV harbors itself chronically in the gut and most tests are run through blood draws from the arm...
the importance of understanding this note is to draw an analogy of dipping a bucket into a lake for minnows and if the bucket came up with only water coming to a conclusion that there are no fish in the lake...well, that may
be true...but maybe there are no fish in that area...and all the other conclusions that can implied.
I understand that "undetectable" is a way to communicate where we are at in our treatment and perhaps our health...but it is relative information and much more conversation about adherence, risk around behaviors, etc. might also assist us in true risk assessment.
The only non-risky behavior is to not have sex or play with yourself - everything else is going to start creating a pile of unknowns. It is up to each one of us to ascertain how comfortable we feel with those unknowns before we move forward.