Theresa R. Cerulli, MD: Oftentimes I’m asked if neuropsychological testing is needed to diagnose ADHD [attention-deficit/hyperactivity disorder]. You may be surprised to hear the answer is no. The sensitivity and specificity of being able to rule in or rule out whether the patient has ADHD is in the 65th or so percentile. In other words, neuropsychological testing isn’t great at making this diagnosis, nor is it a required step in doing so.