The adolescent should be evaluated for ADHD symptoms that occur in more than one setting over a period of at least six months.

If the adolescent's grades are good, we can rule out ADHD as a possible diagnosis."

Screening for ADHD is most effective when we focus solely on the adolescent's behavior in the classroom.

Since adolescents can be less hyperactive than younger children, we don't consider hyperactivity as a criterion in this age group.