ADHD can be difficult to diagnosis for several reasons. First, symptoms of overactivity and inattention are common, especially in young children. Second, there are no direct tests that can diagnose ADHD, and children act differently depending on the person and setting. Third, ADHD commonly occurs in the presence of learning disabilities, autism spectrum disorders, and other emotional disorders (e.g., anxiety and depression), and it is important to rule out the presence of other factors that could be contributing to difficulties paying attention. For these reasons, best practice in evaluating children with ADHD involves completing a comprehensive evaluation.

An evaluation for ADHD might include the following components:

• A diagnostic interview with the parent or caregiver that includes developmental history and current concerns
• Intelligence testing
• Academic testing in reading, written expression, and mathematics
• Testing of attention and executive functioning
• Social, emotional, and behavioral questionnaires completed by parents and caregiver
• Social, emotional, and behavioral questionnaires completed by teachers and other service providers
• A comprehensive written report with an explanation of the findings, DSM-V diagnosis, and recommendations, including resources for services in the community.
• A meeting with families to review the results, recommendations, and develop a plan for treatment and prioritizing services