ADHD Assessment - Why It's Better to Get a Private One Instead of Waiting on the NHS The NHS can offer an individual ADHD assessment but it's a lengthy wait. Some people have reported waiting for up to three years. GPs can refer patients to private clinics or prescribe medication https://hectorkachu.tkzblog.com/29727358/what-is-adhd-assessment-private-and-why-is-everyone-talking-about-it