ADHD Assessment - Why It's Better to Get a Private One Instead of Waiting on the NHS The NHS offers a private ADHD assessment However, the wait is long. Some people have reported waiting for up to three years. Doctors are able to refer patients private clinics or prescribe medications https://psychiatristuk27152.theisblog.com/30021660/why-is-there-all-this-fuss-about-adhd-assessment-private