Delirium Assessment Nursing Procedure: 4AT, CAM-ICU & Escalation Guide
Structured bedside screening for acute confusional states: choose the validated tool your service uses, pair it with vital signs and cause review, and escalate early when altered mental status is new or fluctuating.
Contents
Quick facts
Key takeaway
New or rapidly fluctuating delirium should be treated as urgent until reversible or dangerous causes are assessed: screen with a validated instrument, treat contributors you can address (comfort, oxygen, pain, hydration, sensory aids), and notify the responsible clinician for diagnostic workup.
Quick procedure summary
| Item | Detail |
|---|---|
| Procedure name | Delirium assessment (acute confusion screening) |
| Also known as | CAM, CAM-ICU, 4AT, bCAM, delirium screening (per local policy) |
| Category | Patient assessment — neurological / geriatric / critical care crossover |
| Clinical purpose | Detect delirium early, differentiate from baseline cognitive impairment, trigger cause review and safety measures |
| Who performs | Registered nurses and advanced roles per scope; medical diagnosis by authorised clinician |
| Estimated time | About 2–10 minutes depending on tool and patient factors |
| Clinical settings | General wards, older adult services, emergency care, perioperative areas, critical care |
What is delirium assessment?
Delirium assessment is a focused nursing evaluation that uses attention testing and validated criteria to identify an acute brain dysfunction syndrome characterised by fluctuating course and inattention. It complements—but does not replace—neurological assessment, Glasgow Coma Scale when reduced consciousness is present, and broader admission workup (admission assessment, medication reconciliation).
Overview
Patients with new confusion, agitation, hallucinations, or sleep–wake cycle disruption warrant structured screening, especially when dementia raises baseline vulnerability or when sepsis, urinary tract infection, stroke, or metabolic illness may be driving encephalopathy.
National guidance emphasises risk identification, repeated observation, and multiprofessional management of precipitants. ICU programmes additionally pair sedation depth (for example RASS) with delirium tools such as CAM-ICU or ICDSC as referenced by critical care delirium education resources.
Your role is consistent screening, contextual interpretation (hearing, vision, language), and clear escalation. Combine the screen with vital signs measurement, sepsis screening when infection is suspected, and targeted tests such as urinalysis, basic metabolic panel, or electrolyte panel only as ordered.
Delirium vs dementia vs sedation
Delirium screening is most useful when the nurse separates acute change from chronic baseline and medication-related arousal. These states can overlap, so document the comparison rather than writing only “confused.”
| Pattern | Clues at bedside | Nursing implication |
|---|---|---|
| Delirium | Acute onset, fluctuation, inattention, altered arousal, sleep-wake disruption, hallucinations or agitation. | Escalate for cause review, start safety bundle, and repeat screening after interventions. |
| Dementia baseline | Longer-term cognitive decline without sudden fluctuation; family may describe “usual self” clearly. | Still screen if acutely worse; compare with baseline and avoid assuming all confusion is chronic. |
| Sedation or drug effect | Drowsiness follows opioids, benzodiazepines, anaesthesia, alcohol withdrawal treatment, or ICU sedation changes. | Record sedation/arousal score and reassess when medication effect or arousal changes. |
Indications
| Indication | Nursing rationale |
|---|---|
| New or fluctuating cognition | Captures inattention and altered arousal that may be missed on routine chat; links to safety (fall risk) and discharge planning. |
| High-risk states | Postoperative period, critical illness, acute kidney injury, hepatic or metabolic disturbance (cirrhosis with risk of encephalopathy), and older age with sensory impairment. |
| Behaviour change | Hypoactive delirium may present as withdrawal or fatigue; hyperactive forms overlap with agitation and need differential consideration. |
| Intercurrent illness | Fever, hypoxia, or new medications warrant paired reassessment after treatment begins. |
Limits, contraindications, and when to pause
There is rarely a reason to withhold assessment entirely, but interpretation may be invalid until barriers are addressed.
- Sudden focal neurology, severe headache, or head injury context — urgent medical review.
- Airway compromise, profound hypotension, or suspected stroke — stabilise per emergency pathway.
- Acute withdrawal or toxidrome suspected — escalate; do not rely on screening alone.
- Deep sedation or paralysis invalidates most bedside attention tools until RASS improves.
- Language or literacy barriers require interpreters; document “unable to assess” with reason.
- Severe pre-existing intellectual disability may need adapted approaches per specialist input.
- Positive delirium screen or rapid change from baseline.
- New delusions or command hallucinations with safety risk.
- Staff or family report major fluctuation across the shift.
Equipment and charting access
Institutional protocols may vary for which printed or electronic tool version is approved.
Perform hand hygiene, verify two identifiers, and ensure privacy. If the patient is contagious, apply transmission precautions before prolonged cognitive testing.
Pre-assessment checks
Choosing the right delirium tool for the setting
Tool choice is a clinical safety step, not an administrative preference. A ward tool used on an intubated ICU patient, or an ICU tool used without sedation context, can produce misleading documentation.
| Setting or barrier | Practical choice | Documentation point |
|---|---|---|
| General ward or ED | Use the hospital-approved ward screen, commonly 4AT or CAM-family workflow. | Record acute change source, attention task, and whether sensory aids were in place. |
| ICU, ventilated, or deeply sedated patient | Pair delirium screening with sedation/arousal scoring per unit policy before interpreting CAM-ICU or ICDSC results. | Document RASS or equivalent and mark “unable to assess” when arousal invalidates the tool. |
| Language, hearing, or vision barrier | Optimise interpreter support and sensory aids before testing attention. | Do not score poor access as delirium; state the barrier and repeat when it is corrected. |
A reliable negative screen requires the patient to be testable. If they are too drowsy, aphasic, distressed, or unsupported by an interpreter, the safest note is a transparent limitation plus reassessment plan.
Reversible causes nurses can screen for
Nurses do not diagnose the cause of delirium alone, but a focused screen can surface treatable contributors before the medical review arrives. Pair these checks with family or informant questions about baseline.
Use family, carers, or care-home staff as clinical data sources: baseline orientation, usual mobility, sleep pattern, alcohol intake, sensory aids, recent falls, and the exact time they were last at baseline.
Delirium assessment procedure steps
Verify context and baseline
Confirm identity, location, and reason for admission. Ask an informant (or read prior notes) whether dementia or prior delirium episodes exist.
Optimise physiology and environment
Address glare, noise, and thirst; offer hearing and vision correction. Complete vitals and targeted respiratory assessment if hypoxia or work of breathing is suspected.
Select the correct instrument for the setting
General wards: often 4AT or CAM family tools. ICU: follow unit policy for CAM-ICU or ICDSC with sedation scale pairing. Use the training version your organisation adopted—feature definitions differ by edition.
Test attention deliberately
Most validated tools require formal attention assessment (months backward, digit vigilance, or picture recognition). Record exact task used and patient performance.
Evaluate acute change and fluctuation
Ask nursing colleagues or family whether behaviour varied across the day or from the patient’s usual self. Fluctuation supports delirium over stable dementia alone.
Assess arousal and organised thinking
Document altered consciousness, disorganised thought, or perceptual disturbances consistent with your tool’s definitions. If reduced arousal dominates, integrate GCS findings into handover.
Bundle safety and supportive measures
Reorient gently, maintain day–night cues, mobilise when safe, avoid unnecessary tethers, and involve family for familiar reassurance. Align with multicomponent prevention bundles referenced in national delirium guidance.
Score, communicate, and trigger pathways
Enter delirium status, tool used, and individual features if your EHR supports it. Notify the responsible clinician for positive screens; avoid documenting vague “confused” without a structured result.
Reassess after interventions
Repeat the tool after treating suspected contributors (for example oxygen for hypoxia, catheter issues, infection therapy) to track trajectory. Pharmacologic treatment of agitated delirium (for example antipsychotics such as haloperidol, quetiapine, or olanzapine) is physician-directed; nursing monitors response and adverse effects per protocol.
Sequence at a glance
One-pass structure suitable for handoff teaching.
Findings, complications, and nursing actions
| Finding | Possible concern | Nursing action |
|---|---|---|
| Positive screen | Delirium until evaluated; falls, self-extubation, aspiration risk. | Notify clinician; implement supervision and falls prevention; avoid restraints unless policy-indicated and monitored. |
| Hypoactive pattern | Missed diagnosis, dehydration, infection, opiate effect. | Structured activation, hydration checks, medication review request, gentle mobilisation when safe. |
| Hyperactive pattern | Staff injury, line removal, exhaustion. | De-escalation, environmental modification, one-to-one if required; pharmacologic help only per order. |
| Unable to assess | Data gap may hide delirium. | Document reason (sedation, language, critical illness); reassess each shift or when condition changes. |
Stop cognitive testing if the patient becomes exhausted or unsafe. Escalate immediately for suspected stroke, meningitis, or rapid deterioration—and for any sudden altered mental status where emergency services are indicated per local policy.
Documentation
Clear records support continuity when teams change and audits delirium prevention quality.
“21:10 — 4AT score 7. Attention months backward stopped at March. RASS 0. Oriented to person only. Informant reports normal baseline without hallucinations at home. Vitals stable; urine dip pending. Registrar notified; delirium bundle commenced per protocol.”
- Tool name, version, date, time, and total score or category.
- Attention task used and performance (pass/fail or detail per form).
- Fluctuation source (self, staff, family).
- Sensory aids used and language support.
- Unable-to-assess codes with reason.
- Physician notification and response.
Cross-link to documentation standards for legal completeness.
Patient and family communication
Bedside Decision-Making Questions
NCLEX-style clinical judgment practice — CAM screens after major surgery catch delirium early—items address reversible triggers during delirium assessment, including a priority action, select-all-that-apply cue recognition, trend interpretation after intervention, and matrix escalation matching (recognise cues → analyse → prioritise → act → evaluate outcomes).
Unfolding case — orthopaedic ward. Mrs. Chen, 81, post hip fracture repair yesterday. Night shift reports she was “fine at dinner.” At 02:30 she cannot state the month, stops mid-sentence on months backward, and pulls at her IV. Vitals: temperature 37.9 °C, heart rate 104, blood pressure 118/70 mmHg, SpO₂ 95% on room air. Family says she was fully oriented at home with no hallucinations. Glasses are on the locker but not worn.
Answer key & rationale
Frequently asked questions
Is delirium assessment the same as a dementia test?
No. Dementia screens measure chronic cognitive impairment; delirium tools target acute change, attention, and fluctuation. They complement each other when dementia is known or suspected.
How often should I repeat screening?
Follow local policy. ICU education materials describe at least once-per-shift screening in critically ill adults when using recommended tools; wards often use risk-based frequency after admission or surgery.
Can I screen if the patient is on opioids?
Yes, but interpret cautiously: sedation may produce false negatives or “unable to assess.” Document RASS or equivalent and reassess when sedation lightens.
Should every older adult be screened automatically?
Many systems screen on admission, after transfer, and postoperatively because prevalence is high; confirm your organisation’s delirium pathway.
What if family refuses testing?
Explain purpose and privacy measures. If refusal persists, document and seek clinician guidance; offer alternative reassessment later.
Does a negative screen rule out delirium forever?
No. Delirium fluctuates; repeat after clinical change, new medications, or procedures.
References
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NICE. Delirium: prevention, diagnosis and management in hospital and long-term care (CG103), last reviewed January 2023.https://www.nice.org.uk/guidance/cg103
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NHS. Sudden confusion (delirium) — patient information and emergency advice.https://www.nhs.uk/conditions/confusion/
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CIBS Center / ICU Delirium. Monitoring delirium in the ICU (CAM-ICU and ICDSC resources).https://www.icudelirium.org/medical-professionals/delirium/monitoring-delirium-in-the-icu
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CIBS Center / ICU Delirium. Adult non-ICU care — CAM and bCAM resources.https://www.icudelirium.org/medical-professionals/adult-non-icu-care-monitoring-delirium
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4AT Rapid Clinical Test for Delirium (official 4AT site).https://www.the4at.com/
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Devlin JW et al. Clinical Practice Guidelines for the Prevention and Management of Pain, Agitation/Sedation, Delirium, Immobility, and Sleep Disruption in Adult Patients in the ICU (PADIS). Crit Care Med. 2018;46(9):e825–e873. PubMed:https://pubmed.ncbi.nlm.nih.gov/30113379/
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The Royal Marsden Manual of Clinical Nursing Procedures — neurological observation procedures hub, used for general neurological observation context alongside validated delirium tools.https://www.rmmonline.co.uk/contents/procedures
Editorial standards & medical review
About the author: Sid A. Abdala Balal, RN, writes evidence-based nursing education focused on practical bedside skills, patient safety, and clinical decision support for nurses.
Medical review: This guide is reviewed by Dr. Adam Sayedi, MD, for clinical accuracy, clarity, and alignment with current nursing standards for delirium assessment.
Policies: Medical Review Process · Editorial Policy · Correction Policy