DEAR DOCTOR K: My husband's doctor suspects that he has Alzheimer's disease and wants him to have neuropsychological testing. What will these tests involve?
DEAR READER: There is no single test that can diagnose Alzheimer's disease. In fact, a doctor cannot make the diagnosis with absolute confidence without studying the brain under the microscope, which is rarely done except in an autopsy. Alzheimer's disease is diagnosed presumptively by a combination of different types of evidence. The disease typically has a slowly progressive onset. Sudden confusion or speech problems, for example, are not caused by Alzheimer's.