There is absolutely no diagnostic test for autism that involves making any size of incision on any part of your body. Also, a lobotomy is not a diagnostic procedure. A biopsy, which bears some similarities when performed on the brain, is a diagnostic procedure, but is not performed to detect autism. (More like brain cancer or something, I don't know.) The process of diagnosis currently does not involve needles or knives. Currently, it only involves asking questions of you and your family about your behavior and feelings. And when I was tested as a kid, they also tested how fast my reflexes were and how well I ran, IIRC, and how well I drew shapes and stuff. It's pretty fuzzy now. In the future, testing may involve brain imaging (e.g., MRIs), which involve magnets or radiation or some such thing (I'm tired and I've never studied this, okay?), and may be quite scary, but do not involve making incisions or poking holes.
There's a lot to be scared of in getting a diagnosis, but there are no blades or needles or other stabby, pokey or sharp instruments. Except pens and pencils, but they'll be for the psychologist to take notes. (On paper. Not on you.)
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I'm using a non-verbal right now. I wish you could see it. --dyingofpoetry
NOT A DOCTOR