Peds diagnose ADHD and other such disorders all the time.

I have a friend who is a psych professor (specializing in child development)/child psychologist. She does not prettify her views for me. While she does not really know my DD, she has persistently argued that DD is gifted and intense/sensitive and that's really all. I gave her the scores DD got on some of the instruments she took and she was highly skeptical of her being diagnosed with depression/anxiety, saying her scores were borderline at best. It's not that she disagrees that we need better tools to cope at home, but she objects to DD being given an actual diagnosis. It's certainly interesting to know a psychologist with this POV. I doubt she would be so candid if we weren't friends.