Diagnostic tests for Alzheimer disease: Judicious use can be helpful in clinical practice

![Graphic][1] The evaluation of a patient with cognitive impairment or dementia is part of many neurologists' daily practice. Once it has been established that a patient has mild cognitive impairment (MCI) or dementia, our job is to determine the etiology. Why is this important? Although specific pharmacologic treatment options are still limited at present for most dementias, there are a growing number of clinical trials in which patients...