I'm from the US so it might not be exactly the same, but I had my initial intake evaluation today and it was very simple. The diagnostician started out by reading me the "psychology Miranda rights", ie, "This is what you can expect from assessment, rules about confidentiality, etc.", then she had me fill out a few consent forms and forms allowing her to contact my parents for more information about me, then spent the rest of the hour asking me about my symptoms. We went over social, emotional, physical, sensory, pretty much everything. I was really nervous all day because I didn't know what was going to happen, but it really wasn't so bad. I'm set to take my first proper assessment in two weeks. It might help if you compiled an organised list of past and present symptoms for the doctor to look at between your intake interview and your first assessment; that's what I did, it took three or four days to put together, but it's very comprehensive.
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"Survival is insufficient" - Seven of Nine
Diagnosed with ASD level 1 on the 10th of April, 2014
Rediagnosed with ASD level 2 on the 4th of May, 2019
Thanks to Olympiadis for my fantastic avatar!