What does AWOL stand for in the delirium risk score?

AWOL is an acronym for the four risk factors: Age 80 or older (A), inability to spell WORLD backward (W — attentional impairment), disOrientation (O), and high illness severity/Low reserve (L). Each factor scores 1 point for a total of 0–4.

What is the AWOL score range and what does each level indicate?

Scores range from 0 to 4. A score of 0–1 indicates low delirium risk; 2 is moderate risk; 3–4 indicates high risk of developing delirium during hospitalisation and warrants intensive prevention measures.

When should AWOL be calculated?

AWOL is ideally calculated at or shortly after hospital admission to enable timely implementation of delirium prevention strategies before cognitive decline occurs.

Who developed the AWOL delirium risk score?

AWOL was developed and validated by Douglas and colleagues and published in 2013 in the Journal of Hospital Medicine, based on a cohort of hospitalised adult patients across multiple medical services.

Is AWOL validated for ICU use?

AWOL was originally validated in general medical inpatient populations. Evidence for specific ICU use is more limited; CAM-ICU and ICDSC are the validated tools for ICU delirium detection. However, AWOL's risk factors remain clinically relevant in critical care.

What prevention measures should be triggered by a high AWOL score?

High AWOL scores should activate evidence-based multicomponent prevention: regular re-orientation, early and progressive mobilisation, adequate hydration and nutrition, sensory aid optimisation (glasses, hearing aids), sleep hygiene measures, and avoidance of deliriogenic medications.

Can AWOL be used to monitor ongoing delirium risk?

AWOL is primarily an admission risk-stratification tool. Once a patient is at high risk, ongoing delirium monitoring uses detection tools (DTS, CAM, 4AT) rather than the AWOL score, which does not change dynamically with daily clinical status.

Does AWOL account for pre-existing dementia?

AWOL includes attention (WORLD backward) and orientation, which may be impaired by baseline dementia, but it does not explicitly code for prior cognitive diagnosis. Clinicians should note baseline cognitive status separately, as pre-existing dementia is one of the strongest delirium predictors.

How accurate is AWOL at predicting delirium?

In validation studies, AWOL demonstrated good discrimination for delirium prediction with C-statistics of approximately 0.73–0.78. Higher scores confer substantially elevated delirium incidence rates compared to lower scores.

Is AWOL better than other delirium risk models?

Comparative studies suggest AWOL performs similarly to other brief hospital delirium risk models including the PRE-DELIRIC and E-PRE-DELIRIC scores. AWOL's simplicity (4 easy-to-score items) is a practical advantage in routine clinical use.

Should AWOL scoring change patient assignment or monitoring frequency?

Yes. High-AWOL patients benefit from more frequent nursing cognitive checks, earlier escalation thresholds for confusion, and preferential placement near the nursing station. These environmental and surveillance adjustments complement pharmacological and non-pharmacological prevention.

Can family members use AWOL to assess delirium risk at home?

AWOL is a clinical tool validated in hospital settings and is not designed for patient or family self-administration. However, educating families about the four risk factors can help them recognise high-risk patients and advocate for delirium prevention measures on admission.

Online Medical Tools — AWOL Score

Printed on 9/4/2026

For informational purposes only. This is not medical advice.

Geriatrics

AWOL Score

The AWOL score is a clinical delirium-risk model used at admission to identify patients at elevated risk of developing delirium during hospitalization. Higher scores support proactive prevention bundles and closer cognitive monitoring.

Formula: AWOL total is a point-based delirium-risk score; higher totals indicate higher risk.

AWOL total score

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How It Works

Score Four Risk Factors (One Point Each)

Assign one point for each of four items: (A) Age 80 or older; (W) inability to spell 'WORLD' backward (attentional impairment); (O) disorientation to day, month, or year; (L) severity of illness as reflected by high nursing care needs or APACHE II above 16. Each item is binary (present/absent).

Sum for Total Risk Score (0–4)

Add the four items for a total between 0 and 4. Each additional point reflects an incrementally higher baseline risk of developing delirium during the hospitalisation. The score is intended to be calculated at or shortly after admission.

Activate Prevention Bundles Based on Risk Tier

Patients scoring 3–4 have the highest delirium risk and should receive intensive prevention measures: frequent re-orientation, mobility optimisation, sleep hygiene, sensory aid use, and avoidance of high-risk medications. Lower-risk patients receive standard care with surveillance.

Who Uses the AWOL Score

Hospital Admission Delirium Risk Stratification

Admitting nurses and medical teams

AWOL is designed for completion at admission to identify which patients warrant intensive delirium prevention protocols before any cognitive decline occurs.

Targeted Non-Pharmacological Prevention Bundles

Nursing staff and delirium prevention teams

High-risk AWOL scores activate HELP (Hospital Elder Life Program) and similar multicomponent delirium prevention bundles, directing resources to the patients most likely to benefit.

Pre-operative Delirium Risk Assessment

Anaesthesiologists and surgical nurses

Calculating AWOL pre-operatively identifies patients requiring enhanced post-operative cognitive monitoring, medication review, and early mobilisation to reduce post-operative delirium incidence.

ICU Delirium Prevention Planning

Intensivists and ICU nurses

For ICU patients scoring high on AWOL, early mobilisation protocols (ABCDE bundle), sleep preservation, and sedation minimisation strategies are activated to reduce delirium burden.

Geriatric Hospital Resource Allocation

Geriatric programme directors and care coordinators

AWOL helps prioritise limited geriatrician and specialist nurse time toward patients at highest delirium risk, maximising the impact of prevention programmes in resource-constrained settings.

Pro Tips

AWOL Identifies Risk, Not Delirium

A high AWOL score at admission indicates delirium vulnerability, not current delirium. Use DTS or 4AT for current delirium detection. AWOL's value is in the predictive window — it enables prevention before delirium develops.

WORLD Backward Is a Reliable Attention Test

Inability to spell WORLD backward reflects attentional impairment, which is a pre-delirium warning sign. Even partial spelling errors count as impaired. This test is quick and does not require literacy if adapted to a digit span task instead.

Age Alone Confers Substantial Risk

Patients 80 or older who score 1 point on age alone have meaningfully elevated delirium risk compared to younger cohorts. Do not wait for additional risk factors to activate basic prevention measures in octogenarians.

Use AWOL to Activate HELP or Similar Programmes

The Hospital Elder Life Program (HELP) and ABCDE (Awakening, Breathing, Coordination, Delirium, Early mobility) bundles are proven prevention interventions. Link AWOL score thresholds directly to protocol activation criteria.

Reassess Illness Severity Component Daily

The illness severity item may change as clinical status evolves. Consider reassessing AWOL daily in patients who were initially low-risk but whose condition deteriorates — sepsis, respiratory failure, or new organ dysfunction dramatically elevate delirium risk.

Integrate With Medication Review

High-risk AWOL patients should trigger immediate pharmacy review for deliriogenic medications: anticholinergics, benzodiazepines, opioids, and polypharmacy. This is one of the most impactful and reversible delirium risk factors.

Document Baseline Cognitive Status Separately

AWOL scores a single attentional test, but baseline dementia or cognitive impairment is a powerful independent delirium risk factor. Document informant-reported baseline separately — AWOL underestimates risk in patients with unrecognised dementia.

Explain Risk to Patients and Families

High-risk patients and their families benefit from pre-emptive education about delirium — what it looks like, that it is common, and that it is not permanent in most cases. Family involvement in reorientation is an effective prevention strategy.

Common Questions About Your Results

Evidence-Based Methodology

AWOL-style risk models are used in hospital delirium prevention pathways with published predictive performance studies.

Clinical Content Trust

Last reviewed:: April 21, 2026
Guideline version:: Delirium Risk Stratification Review 2026.04
Source set version:: AWOL source set v1

How to Interpret Your Result

Higher AWOL totals indicate greater predicted delirium risk and support proactive prevention strategies.

When to Use This Tool

Use at admission to identify patients who may benefit from intensified delirium prevention and monitoring.

Limitations

Prediction performance can vary across institutions and populations; local validation improves utility.

Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.

Sources

Changelog

April 21, 2026 · v1.0.0
Added AWOL risk score entry with evidence links and structured trust metadata.

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