Technically, I saw an adolescent health physician specialising in transgender health. He recorded my weight and blood pressure. He wanted to know my history with gender dysphoria, any psychiatric problems, and reasons for wanting to start testosterone. There were definitely a lot of questions about my mental state, he checked my level of depression and how I had been reacting to my medication, how long and what dose, etc. A lot of questions pertaining to mental stability and physical health. He talked to my mother as well, since I'm a minor. He wanted to know how my family was reacting to the situation, and to make sure I had a support system in place. Questions about what I expected would happen on testosterone, what I saw as the advantages, if I had any reservations or changes I wasn't looking forward to. How my transition has been going so far, my coming out, situations with passing or not passing, my anxieties.
I asked about his experience with transgender issues, how many patients he had seen through HRT, and what his preferred administration of testosterone was (in terms of injection vs gel, location, initial schedule for administration). We discussed the most common complications and what can be expected to change or not change.
He gave me a packet of information and a more thorough questionnaire to fill out and return to him. I gave him my therapist's contact info. It was several appointments until I got a prescription for testosterone, and I had to wait until the appointment after that so he could teach my how to self inject. Things he did at other appointments included addressing my parents' concerns, further discussing mental health, giving me a routine physical, and going over bloodwork results.
I'd say it's unlikely you'll get testosterone the first appointment, unless your psychiatrist has been communicating with the endo ahead of time, and you've already gotten blood tests done. But, every doctor's process is different. Your endo might be much less thorough with the questioning and confirmations. If you do end up getting an injection 2 weeks before the test, I wouldn't worry about it - maybe a lower dose would be a good idea, but all I noticed with my voice was being slightly more comfortable in a lower range. It would just go there more automatically, and that might have been psychological. I didn't lose range at all, or get any crackling.