ADHD diagnoses have been on the rise for decades. With the current diagnostic criteria based largely on its presentation in children, there is widespread debate about how best to accurately diagnose ADHD in adults. Many practicing providers were trained to use neuropsychological assessments to enhance diagnostic specificity and may be skeptical to drop their robust assessment batteries. However, new research is suggesting that these measures are not accurate in correctly differentiating ADHD and non-ADHD patients. Other diagnostic options include clinical interview and questionnaires, which are helpful but have high face validity that can lead to concerns with malingering and/or unconscious bias from clients. This presentation will review existing literature on comprehensive adult ADHD diagnosis, the pros and cons of existing assessment tools, and will introduce the EEG as a potential new tool to aid in diagnostic accuracy.