Neurologists diagnose cognitive impairment with a clinical exam of memory and thinking skills. To determine whether Alzheimer’s disease is the cause of the cognitive impairment, evidence of the specific brain changes that characterize Alzheimer’s must be obtained, typically via a brain scan or spinal tap. Identifying people whose cognitive symptoms are due to Alzheimer’s disease is critical now that new Alzheimer’s therapies are available that could change the course of the illness.
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