Thanks for the feedback, guys. I wound up coming out anyway...it wasn't a perfectly comfortable situation. He kept asking me why I wanted labs and particularly why I wanted a testosterone test, and he saw that I was being evasive. I'm not very good at that when it really counts--only when it doesn't! So I finally told him. I'm not sure whether it was the right thing to do, but he did tell me that he doesn't judge people's decisions and lifestyles and the like. That response is not ideal, and he could have been a bit warmer; but it could have been worse. And, of course, I was nervous and probably read more ambivalence into it than was really there.
After I told him, he remained professional and talked to me about my general health. He promised to have the labs back in the next day or so for me to pick up (what a relief--I had such a hard time scheduling an appointment that I was afraid I wouldn't get them in time). And he recommended that I take some calcium supplements for my bones but noted that testosterone should help. He seemed genuinely concerned about me, so that's good. So I'll keep seeing him, at least for now.
Here's a funny. Since I had seen him before many years ago, they had scrounged up my old records. I was in the waiting room filling out forms when they called a strange name--the name of a famous movie actress of yesteryear who has the same last name as mine. So I'm sitting there, thinking, "Imagine growing up with THAT name!" And then they called my name. When I went up, the nurse asked me which one I prefer. I blanked out and said most articulately, "Huh?" She flashed me the folder, which had two names on it--the actress name and my name. I stared at them stupidly for a moment or two before I got it. (Hey, I'm running waaay short of sleep this week.)
Apparently, I started seeing this doctor right before I changed my name many years ago. On the chart, though, they didn't just write down my original birth name and my current legal name. Someone had written an
incorrect perversion of my given birth name and combined it with my current last name.

I'm not sure how they arrived at that particular combination or how they managed to so badly torture my original given name, but there it is. I suppose they simply mistook the given name and then assumed that I had gotten married or something. Weird.
So I'm out to my GP now, whether I like it or not. I just hope the insurance still covers the visit and the labs. He said it would, but I'm skeptical because he noted in the paperwork that I was thinking about seeing an endo for HRT for my trans situation. We'll see what happens.
At least I got through it, huh? I was pretty nervous. I always blow these things out of proportion. That's me, Arch the drama queen.