Evaluating ADHD is a complicated procedure that requires a lot of experience mainly because there is not a single instrument that can determine ADHD. This leaves the evaluator with having to rule out the other diagnoses that can be confused with ADHD like anxiety disorder, learning disability and bipolar disorder. There are some instruments called continuous performance test that are good measures of the attention part of the ADHD spectrum. Bottom line is your friendly eighborhood neuropsychologist needs to have some experience because there is not just one test that gives you your answer.