It's easy to tell if you pass.
Step one: out yourself
Step two: see what the other person says
I have had a couple of occasions where I kinda had to out myself like when I started seeing a new therapist. I told her all about my life except that I was TS until she asked if there was anything else I thought she should know. I said I'm TS she said wow I never would have known!
I had one more similar experience and that person said basically the same thing.
If you want to know if your voice "passes" just call someone and see if they call you ma'am or sir.