It depends on your individual circumstances, but as a general rule, they're not allowed to accept you into the pathway until two consultants/professionals have met with you and agreed that you can go ahead and be accepted into the pathway, acceptance into the pathway is in itself, diagnosis, and it's them basically saying you require treatment and you will be under their care. But it takes at least the 2 appointments, then you're likely to be accepted at the third one, which is when they will speak to you about HRT and will contact your GP, what you don't mention is how far along your transition you are or any of that. So again all this depending on your own situation. But that's the general guideline. I'm not sure why you want tests done? when they decide to start you on HRT, they will contact you and your GP with kind of a guide, and you will have a baseline test (before you start) and a test some weeks after you've been started on HRT to monitor and modify if needed to bring your hormones to female levels.