There is strong clustering for sure, but also good and recent evidence that ASD, ADHD, and ASD + ADHD (the community has adopted the term Audhd) are distinct at a genetic level. Those and related comorbidities are tied to dopamine transport, and thought to be strongly impacted by endocrine disruption. Brain scans reveal most differences in the basil ganglia and cerebellum, and then downstream dysfunction in the frontal lobe with executive function and sensory processing issues.
Extensive testing can yield pretty specific and accurate results. You won't get that from an hour one session but my testing took ~ 15 hours total. Expensive but worth it for me.
