My endocrinologist totally didn't check levels, in fact I've never had them checked. When I asked about it, he said "Yeah sure you can if you want, but it's a waste of money / not really important right now". He said it takes a while to flood the cells with E and that it doesn't really matter to check until you've been on HRT for some amount of time... He thinks levels are irrelevant at first because the body holds on to testosterone.
I trust him- and no complaints at all when he popped the question "So how many pellets do you want? You can choose between 2-13". Starting out, I chose 7- when I began HRT in December. April 1st I have my second appointment for pellet implantation. Things have been going really well so I'm going to go up a bit more- probably 10 or 11 pellets.
I'm sure sometime soon I'll get the levels checked, but he didn't seem concerned about it at all starting out. He has been described to me by my therapist as a "maverick" <- lol. I dig it.