Before my diagnosis, I wrote up a ten-page organised list of all my traits from early childhood to the present. I'm glad I did, because one of the first questions the clinician asked me was, "Why do you think you have Asperger's?" and, despite having prepared for that moment for literally years, I panicked and my mind went completely blank.
What I did was break the traits down into categories, like "Social Reciprocity" and "Nonverbal Behavioural Patterns", and within those categories, I had age groups, "0-3", "4-6", "7-9", "10-12", "13-15", "16-18" and "19-21" (my current age at the time of assessment). I then used bullet points to briefly note the most prominent examples of the header trait I displayed within each of the age brackets, and at the end I had a bulleted list of "miscellaneous traits" which didn't fit into any of the specified categories, but which might still be relevant to ruling a diagnosis in or out, such as the fact that I didn't have a speech delay, my mild auditory processing problems, my close to eidetic memory for paired visual-auditory input, my total lack of directional sense, etc. For traits like sensory sensitivities, which didn't change much over the course of my life, I simply left out the age brackets, and added under the header, "Oberved across lifespan unless otherwise specified", then bulleted examples of each of the types of sensitivity I had under the appropriate labels, "sight" "sound" "touch" etc.
This list was also helpful for my clinician because it gave her something to look back on after our initial session was over and she was organising her notes. My diagnosis was completed in four one to two-hour sessions, spanning the course of two months. My fifth and final session, in which I received my diagnostic report, came five weeks after my final evaluation (the ADOS 2 test), so in my case, it was important that the person diagnosing me was able to go back and refresh her memory about things we'd discussed during the first session.
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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!