An estimated 6.1 million children in the United States have been diagnosed with ADHD. Millions more children with the disorder are surely left undiagnosed. Early intervention is so crucial for success down the road, at home and at school. It is important that teachers—who play a key observational role in ADHD assessments in a school setting—understand that many factors can play into a diagnosis and how racial, gender, and age biases can affect those factors. It is equally important that school systems provide educators additional support through more objective testing measures, many of which already exist.