One of the most overlooked rules in childhood ADHD evaluation has nothing to do with symptoms at all — it's about where those symptoms show up. And it changes what a "yes" from a teacher or a parent alone can actually tell you.
Why one setting isn't enough
A child can be perfectly focused at home doing something they love and completely unable to sit still in a classroom of 30 kids. That contrast doesn't rule ADHD out, but a pattern that appears in only ONE setting more often points to something environmental, a mismatch with a particular teacher's style, boredom, or a specific stressor, rather than a pervasive developmental pattern.
What "two settings" usually means in practice
In practice, this means clinicians want to hear from more than just the parent. A teacher's observations, a coach's, or a relative's, gathered independently, carry real diagnostic weight precisely because they're less likely to share the same bias as a single source.
- Home only: worth exploring family routines, sleep, and screen habits first.
- School only: worth exploring classroom fit, curriculum pace, and social dynamics first.
- Both: the pattern most consistent with an ADHD-style presentation.
A teacher's independent observation isn't a formality, it's often the piece of evidence that turns a suspicion into a case worth evaluating.
If you're only seeing the pattern in one part of your child's life, that's useful information too, it just points toward a different kind of conversation than a full evaluation.