There is no single test or procedure used to diagnose ADHD. Experts diagnose ADHD when symptoms impact a person's ability to function on a day-to-day basis for longer than 6 months. These symptoms include: Hyperactivity: - Difficulty sitting still - Continually fidgeting - Inability to concentrate on tasks - Excessive movement - Consistently hopping from one task to another Inattentiveness:  - Having a short attention span - Easily becoming distracted - Making irresponsible choices   - Being consistently forgetful - Losing things - Difficulty following through on tasks that are monotonous or time-consuming - Difficulty organizing and/or prioritizing tasks Impulsiveness: - Excessive talking - Inability to wait their turn - Acting without thinking and without thought of consequences - Interrupting conversations - Minimal or non-existent sense of danger A specialist may conduct interviews with the parents, perform psychological testing, and use questionnaires and rating scales to help make their diagnosis. They may also perform physical examinations to rule out any other conditions.