One of the diagnostic criteria is that the symptoms happen in multiple areas, including home and school.
This is a huge red flag for me as well.
The same is sort of true for my DS... his behaviours and reactions change according to his environment, and yet the psychologist still said ADHD.
I can't get a straight answer - everyone has a different take on how ADHD (and ASD) presents, no doubt in part due to the complexity of the conditions as well as the individuality of kids. Luckily there are pieces from both that overlap which makes addressing it all easier.
