ADHD Assessment - Why It's Better to Get a Private One Instead of Waiting on the NHS The NHS can provide a private ADHD assessment however, it's a long wait. Some people have reported waiting for up to three years. Doctors can refer patients to private clinics or prescribe medication https://milogqkww.qodsblog.com/29899380/adhd-assessment-private-s-history-of-adhd-assessment-private-in-10-milestones