Common Symptoms
New Confusion / Altered Mental Status
New confusion or altered mental status in an older adult is delirium until proven otherwise — and delirium is a medical emergency that demands a source. The differential is wide: infection (UTI, pneumonia, sepsis), medications (anticholinergics, benzodiazepines, opioids), metabolic derangement (hypo/hyperglycemia, hyponatremia, hypercalcemia, uremia, hepatic encephalopathy), hypoxia, intracranial pathology (stroke, hemorrhage, subdural hematoma), urinary retention, and pain. This page walks through differentiating delirium from dementia and depression, the structured CAM assessment, the minimum safe first-pass workup (vitals, POC glucose, full med review, UA, BMP, CBC, focused neuro exam), what can be managed outpatient with a strong support system, escalation criteria, documentation, and caregiver return precautions. Written for NPs, PAs, and MDs caring for older adults.
Full clinical workflow, red flags, dosing, and documentation below. Subscribe to read the full guide.
Common Symptoms
New Confusion / Altered Mental Status
Why this symptom matters
Acute mental status change in older adults is often the first sign of a serious systemic illness — and it's frequently misattributed to "baseline dementia." It is not a UA-and-go diagnosis. Don't reflexively send a urine culture without urinary symptoms.
What must I not miss first?
- Hypoglycemia / hyperglycemia / DKA
- Hypoxia or hypercarbia
- Stroke / intracranial hemorrhage / subdural (anticoagulated, falls)
- Sepsis
- Medication toxicity (opioids, benzos, anticholinergics, polypharmacy)
- Severe electrolyte derangement (Na, Ca)
- Hepatic / uremic encephalopathy
- Nonconvulsive seizure
- Wernicke's (alcohol use)
Red flags — escalate or work up urgently
- Acute onset (hours to days) — especially with fluctuation
- Hypoxia, hypotension, fever
- Focal neurologic deficit or new asymmetry
- Anticoagulation with recent fall or trauma
- Hypoglycemia or rapid blood sugar shift
- Recent medication change, opioid prescription, or possible overdose
- Inability to protect airway
Minimum safe first-pass workup
- Vitals + pulse ox + glucose immediately
- Focused neuro exam, mental status, signs of trauma
- Med review — anticholinergics, benzos, opioids, sedatives, recent additions
- CMP, CBC, TSH; targeted labs by suspected cause
- UA only if urinary symptoms or signs of infection — not reflexively
- CT head if focal deficit, anticoagulation + fall, or suspected stroke/hemorrhage
What can usually be managed outpatient
- Identified reversible cause (e.g., dehydration, medication side effect) with hemodynamic stability and reliable caregiver
- Stable chronic cognitive impairment without acute change after careful workup
- Sundowning in established dementia with no acute findings
When to escalate to ED / higher level of care
- Any focal deficit, hypoxia, hemodynamic change, or inability to protect airway
- Suspected stroke, hemorrhage, sepsis, or severe metabolic derangement
- Anticoagulated patient with new AMS or fall
- Unsafe home environment or no reliable caregiver to monitor
What to document when the diagnosis is still uncertain
- Baseline cognition + timeline of change (and source of that information)
- Vitals, glucose, pulse ox, focused neuro exam
- Medication review with potential offenders named
- Why imaging or specific labs were or were not ordered
- Disposition reasoning — including caregiver capacity
Safety-net & return precautions to give
- Return or call 911 for new weakness, slurred speech, severe headache, fever, fainting, falls, or worsening confusion.
- Caregiver should call if patient becomes harder to wake, won't eat/drink, or stops making sense.
- Recheck in [24-72 hours].
Educational guidance for clinicians. Not a substitute for clinical judgment. Always individualize to the patient and your local resources.
Evidence sources
- · AGS Delirium Clinical Practice Guideline
- · ACEP Clinical Policies
Review status
Last reviewed: 2026-04
Reviewed by the MyClinicianGuide editorial team. Cadence: annual.
Educational reference for licensed clinicians (NP, PA, MD, DO). Not a substitute for clinical judgment, institutional protocols, or specialty consultation. Apply in context of the full clinical picture, patient goals, and current standards of care. See About AI guidance for AI-related limitations.
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