There's no single test to diagnose ADHD. Instead, doctors rely on several things, including:
Interviews with the parents, relatives, teachers, or other adults
Personally watching the child or adult
Questionnaires or rating scales that measure symptoms of ADHD
The doctor needs to see how much a person’s symptoms are affecting his daily moods, behavior, productivity, and lifestyle habits. And he needs to rule out other conditions.
With children, the doctor will...
Executive function can be divided into two groups:
Organization: Gathering information and structuring it for evaluation
Regulation: Taking stock of your surroundings and changing behavior in response to it
For example, seeing a piece of chocolate cake on a dessert cart at a restaurant may be tempting. That's where executive function can step in. The organizational part reminds you that the slice is likely to have hundreds of calories. Regulation tells you that eating the cake conflicts with goals you may have, like eating less sugar or losing weight.