ADHD Assessment - Is it Time For Adults to Get a Diagnosis? The UK's ADHD services are at a crucial point. There is an increase in awareness of the disorder, however there are there are a lack of resources and lengthy waiting times. GPs are able to relay symptoms and ask questions, however they are unable to diagnose ADHD or deny an assessment by an expert doctor. This is a medical decision that can only be made by a psychiatrist. ...