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ADHD Testing - The First Step to Diagnosing ADHD A thorough ADHD evaluation includes a thorough interview with the person being evaluated, and one or more questionnaires that are designed to evaluate the severity of symptoms. Teachers and parents are often also interviewed. To be diagnosed with ADHD children or adults should exhibit a symptomatic behavior in at least two or more situations and the symptoms aren't triggered by other medical issues, such as a thyroid disorder or seizure