ADHD Assessment and Diagnosis A diagnosis and evaluation of ADHD can change the lives of teenagers and children. A diagnosis and a tailored treatment plan can allow them to maximize their learning environment and realize their maximum potential. A diagnosis of ADHD is not always readily available on the NHS. https://telegra.ph/15-Startling-Facts-About-ADHD-Diagnosis-Private-That-You-Never-Knew-03-07