May I suggest lab work the day of shot, just prior to injection (as is reasonable)? It will give you a better picture of your trough.
I think we are saying the same thing.
I run the labs the same day I'm due for my next shot. Wake up, hit the lab at 8 am when they open, then inject. So if I inject on Saturday and next injection is due for Monday (EOD schedule) then I'd run labs Monday morning prior to injection.