(I'm the author.) You're right that there isn't (yet) a medical test like a blood test or an MRI to detect autism. In France, the official "diagnosis" is establ

(I'm the author.) You're right that there isn't (yet) a medical test like a blood test or an MRI to detect autism. In France, the official "diagnosis" is established by a psychiatrist based on interviews and questionnaires with the person, and some of their family members if possible. That's how it happened for me, and at the end of the evaluation process, they said I met "the criteria (CIM 10 and DSM IV) for a diagnosis of autism spectrum disorder, and in particular for Asperger syndrome (CIM 10: Axis I, F84.5)". I haven't looked into what those numbers refer to exactly, and I don't like all the medical connotations, but that's how it's done in France. There's a screenshot of the report in an post I published earlier this year (in the "self-discovery" section: https://guillaumepaumier.com/2015/02/22/2014-in-review/ https://guillaumepaumier.com/2015/02/22/2014-in-review/ ).