Diagnostic Workup for Short-Term Memory Loss in Elderly Patients

Initial Assessment

The American Academy of Neurology recommends using the Montreal Cognitive Assessment (MoCA) with a cutoff of 26/30 for potential cognitive impairment (sensitivity 90%, specificity 87%) 1
Alternative: Mini-Cog takes only 2-3 minutes and includes three-word recall plus clock drawing (sensitivity 76%, specificity 89%) 1
Obtain corroborative history from a reliable informant about changes in cognition, function, and behavior using structured tools like AD8, IQCODE, or Quick Dementia Rating System 2, 3, 4

Complete blood count with differential (rule out anemia) 2, 4
Comprehensive metabolic panel including electrolytes, calcium, magnesium, liver function tests 2, 4
Thyroid function tests (TSH, free T4) 2, 3, 4
Vitamin B12, folate, and homocysteine levels 2, 4
HIV testing if risk factors present 3

Compile a complete medication list by having the caregiver bring in all bottles, including prescription, over-the-counter drugs, and supplements 5
Minimize or avoid medications with anticholinergic properties and identify potentially inappropriate medications 2
Assess for drug interactions and side effects that may contribute to cognitive symptoms 5, 4

MRI is preferred over CT, especially for detecting vascular lesions 2, 3
Anatomical neuroimaging is recommended when: onset of cognitive symptoms within past 2 years, unexpected decline in cognition or function, recent significant head trauma, unexplained neurological manifestations, or significant vascular risk factors 3, 4

Evaluate for conditions that may affect cognition: sleep disorders, sensory deficits, depression and anxiety, pain and mobility problems 2, 3, 4

Dementia is diagnosed when cognitive or behavioral symptoms interfere with ability to function at work or usual activities, represent a decline from previous functioning, and are not explained by delirium or major psychiatric disorder 3
Refer to memory clinic or specialist for patients with mild cognitive impairment, those at high risk of dementia, or cases requiring detailed neuropsychological testing to establish extent and severity of impairment 3, 4

Schedule follow-up visits every 6-12 months to track disease progression using a multi-dimensional approach: cognition, functional autonomy, behavioral symptoms, and caregiver burden 2, 3, 4