Carlton is 70 years old and has recently lost his wife and his best male friend within the past 3 months. His daughter brings him to the clinic because he has become forgetful, is not eating, has been sleeping poorly, and is frequently complaining of many aches and pains. Which assessment instrument would be most helpful at this time, considering his symptom presentation?

Choice A reason: The patient exhibits classic symptoms of "pseudodementia," where geriatric depression mimics cognitive decline. Given his recent significant losses (bereavement), poor appetite, sleep disturbances, and somatic complaints (aches and pains), the Geriatric Depression Scale is the most targeted tool to differentiate depression from primary neurocognitive disorders. Choice B reason: The Mini Mental Status Exam is a tool primarily used to screen for cognitive impairment and the severity of dementia. While it might be used eventually, it does not address the underlying etiology of the patient’s symptoms, which strongly suggest a mood disorder following major life stressors. Choice C reason: The Delirium Rating Scale is utilized to assess the severity of symptoms in patients already suspected of having delirium. This patient’s symptoms have developed over 3 months, suggesting a more chronic or subacute progression rather than the acute, fluctuating consciousness typically seen in a delirium presentation. Choice D reason: The Confusion Assessment Method is the gold standard for identifying the presence of delirium, characterized by acute onset and inattention. Since Carlton’s symptoms are closely tied to grief and somatic issues, depression is a more likely primary diagnosis than the acute medical emergency of delirium.