Can Lab Work Tell Why Low T Happens?

I’m curious to know if my low T is due to my testes being signaled to produce it but not producing enough, or if the signal to produce it (LH) isn’t sufficient to get the levels I need.

My labs are in this thread: Anything to Track to Help My TRT Doc? - Testosterone Replacement - Forums - T Nation

Can anyone tell me what to look for?

Thanks!