ADHD Assessment - Why It's Better to Get a Private One Instead of Waiting on the NHS The NHS offers the option of a private ADHD assessment However, the wait is long. Some people have reported waiting for three years. GPs can refer patients to private clinics or prescribe medication https://psychiatry45205.bloggazza.com/29094541/the-history-of-adhd-assessment-private-in-10-milestones