Fine on Monday, lost by Thursday: delirium, dementia or depression in the confused older adult
Three conditions make an older adult confused. One of them is a medical emergency, and the NCE hides the clue that says which in how fast it happened.
By Dr. Andrew Wichterman · October 2, 2026 · 6 min read
An older adult who is suddenly confused is one of the few vignettes on the NCE where the keyed answer sends the client out of your office. Candidates who know the DSM well still miss it, because they reach for a diagnosis when the item is asking about a timeline.
The practice item discussed here was written for this site in the style of the NCE. It is not a question from the actual exam. NBCC does not release its items, and candidates sign a nondisclosure agreement.
- Delirium
- Hours to days. Fluctuates across the day. Attention fails first. A medical emergency.
- Major neurocognitive disorder
- Months to years. Steadily progressive. Memory fails first; attention holds early on.
- Depression
- Weeks. Mood changes first. The client complains about memory and answers "I don't know."
The item
A 78-year-old woman is brought to a community agency by her daughter, who says her mother "has not been herself since Tuesday." For three days the client has been disoriented in the evenings, giving the wrong year and once failing to recognize her son-in-law, but she seemed "almost normal" at breakfast. Her husband died four months ago, and she started a new medication for sleep last week. In session her attention drifts and she loses the thread of simple questions. What should the counselor do FIRST?
A. Begin grief counseling focused on the loss of her husband
B. Administer a depression inventory to assess for a major depressive episode
C. Refer the client for an immediate medical evaluation
D. Recommend a neuropsychological evaluation for a major neurocognitive disorder
Keyed answer: C. Three days, worse in the evening and better in the morning, attention that will not hold, a new medication, age 78. That is the picture of delirium, and delirium is a medical emergency until a physician says it is not. Everything else on the list is a reasonable second step.
What the item is really testing
Whether you sort confusion by onset before you sort it by content. Three conditions produce a confused older adult, and the DSM separates them mostly by time. Delirium develops over hours to a few days, represents a change from baseline, and fluctuates within a single day. Major neurocognitive disorder, the DSM-5-TR term for dementia, develops over months to years and gets steadily worse. Depression develops over weeks, and the cognitive complaints arrive with the mood, not before it.
The second feature is attention. The defining disturbance in delirium is attention and awareness: the person cannot focus, sustain or shift attention, and the memory and orientation problems follow from that. In early dementia, attention is relatively preserved; the person can follow a conversation but cannot recall it later. The vignette tells you her attention drifts in session. On the exam, impaired attention in an acutely confused older adult is the delirium flag.
The third feature is the cause. Delirium is always the direct result of something physiological: an infection, a medication, withdrawal, dehydration, a metabolic disturbance, surgery. In older adults the usual culprits are a urinary tract infection, pneumonia, and a new or changed medication, especially sedatives, anticholinergics and opioids. The vignette hands you a new sleep medication started last week. That detail is not scenery.
Why each wrong answer tempts you
A. The loss is real, four months is recent, and grief counseling will probably be appropriate. But bereavement does not make a person fail to recognize her son-in-law on Wednesday and recognize him on Thursday morning. Starting grief work now treats a medical problem as a psychological one, and the exam punishes that every time.
B. She may well be depressed, and late-life depression does impair concentration. But depression does not come and go across a single day, and a questionnaire cannot rule out a delirium. If the depression inventory is the first move, the medication keeps doing what it is doing while you score it.
D. This is the most sophisticated wrong answer. Dementia is a diagnosis of months to years, and the DSM-5-TR criteria for major neurocognitive disorder say outright that the deficits must not occur exclusively in the context of a delirium. You cannot evaluate for dementia while a delirium is running; the results would be invalid and the delay dangerous. Neuropsychological testing comes after the medical workup, if deficits persist once the acute episode clears.
The one clue that can mislead you
Worse in the evening is not unique to delirium. People with dementia often deteriorate late in the day, a pattern called sundowning, and a candidate who knows that may read "almost normal at breakfast" as a dementia clue. What separates the two is how long it has been happening. A daughter whose mother has sundowned for a year does not say "since Tuesday." The acute change from baseline is the signal, and the vignette gives it to you in the daughter's own words: she has not been herself.
The two conditions also coexist. Delirium superimposed on dementia is common in older adults, and a person with mild memory loss who becomes acutely confused still needs the same medical evaluation. The presence of a slow decline never cancels the urgency of a fast one.
Depression that looks like dementia
Older textbooks called this pseudodementia. The DSM does not use the term, but the exam still tests the pattern. A depressed older adult complains about memory, often more than the memory problem warrants, gives up quickly on cognitive tasks and answers "I don't know" rather than guessing. A person with early dementia tends to minimize the problem, works hard to cover it, and may confabulate an answer; it is the family who makes the appointment. Orientation stays intact in depression and erodes in dementia. And when the depression is treated, the cognitive complaints improve, which is the strongest argument for screening every confused older adult for depression once delirium has been excluded. The Geriatric Depression Scale, with its yes-or-no format, was built for exactly this population.
What the counselor does, in order
Treat the acute change as medical until a physician has ruled out delirium. That means telling the daughter plainly that this needs a doctor today, not next week, and helping her get there: a call to the primary care provider, or urgent care or the emergency department if the provider cannot see her. Send the timeline, the name of the new medication, and what you observed about attention and orientation.
Gather collateral while you have the daughter in the room. When did she last see her mother at baseline? What changed in the last two weeks: medications, a fall, an illness, how much she has been eating and drinking? Document your mental status observations in plain language. Recognizing delirium is within a counselor's scope; the workup is not.
Then plan for what comes after. If the delirium resolves, screen for depression and begin the grief work the daughter came in for. If cognitive deficits remain once the acute episode has cleared, that is when the neuropsychological referral in option D becomes the right answer. The exam rewards the sequence, not the single best idea.
Where this lives in the course
Domain 3, Areas of Clinical Focus: the lesson "Adult development and aging," whose section on cognition and aging separates normal change from pathology. Pair it with Domain 2's "Diagnosis, the DSM-5-TR and the mental status examination" for the attention and orientation findings this item turns on. Add the three onsets to your flashcard queue: hours to days, weeks, months to years.
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Every deep-dive item on this site was written for the site in the style of the NCE. None is from the actual exam.