Topic: Alzheimer's Disease
Subject: Medicine
Which one of the following tests is most useful for the initial workup of suspected Alzheimers disease?

Occult hyper- or hypothyroidism can imitate the symptoms of Alzheimers disease, especially in the elderly, and thus should be considered in the initial workup.
>Cardiac stress testing, carotid Doppler ultrasonography, and an erythrocyte sedimentation rate are not part of the routine evaluation for Alzheimer's dementia.
>A lumbar puncture for cerebrospinal fluid pressures would be indicated only if normal pressure hydrocephalus is suspected.
>Neither the cerebral angiogram nor the cardiac stress test is useful for the initial evaluation of Alzheimer's disease.