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ADHD Testing - The First Step to Diagnosing ADHD A complete ADHD evaluation involves a thorough interview with the person being assessed, and one or more standardized questionnaires designed to rate the symptoms. Parents and teachers are usually also interviewed. To be diagnosed with ADHD, adults or children must have symptomatic behavior in at least two or more situations and the symptoms aren't caused by other medical issues, such as seizures or thyroid disorders. History C