In how many settings must symptoms of ADHD be observed for a diagnosis?

For a diagnosis of Attention-Deficit/Hyperactivity Disorder (ADHD), symptoms must be observed in at least two different settings. This requirement underscores the pervasive nature of ADHD, meaning that the symptoms should not be limited to one environment or context, such as home or school. By having symptoms evident in multiple settings, it helps to confirm that the behaviors are not just situational but indeed part of an ongoing pattern that impacts the individual across various aspects of their life.

This requirement is crucial for differentiating ADHD from other conditions that may only appear in specific contexts. For example, a child may exhibit hyperactivity in a classroom setting due to strict structure but may not show these behaviors at home where the environment is more relaxed. Observing symptoms in at least two settings reinforces the idea that ADHD is a chronic disorder that can affect a child's functioning in different areas, including academic performance, social interactions, and family dynamics.