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How Long is the Waiting List For ADHD Assessments in the UK? If think you have ADHD If you suspect that you have ADHD, talk with your GP about it. They should consider your concerns seriously and refer you for an assessment. You could have to wait for several days before you can schedule an appointment. The NHS has a list of those waiting to be evaluated for ADHD. You can find this information on the website of your local trust, or by making an Freedom of Information request.