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Printed on 7/21/2026
For informational purposes only. This is not medical advice.
The Brief Confusion Assessment Method (bCAM) is a streamlined delirium screening approach designed for fast use in emergency and acute-care contexts. It follows CAM-style feature logic and classifies delirium screen status as positive or negative.
Formula: bCAM output is binary: positive or negative delirium screen based on feature logic.
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The bCAM evaluates four features: (1) acute onset and fluctuating course of mental status, (2) inattention assessed by reciting months backward or digit span, (3) disorganized thinking using two yes/no questions, and (4) altered level of consciousness. Total assessment time is approximately 2 minutes.
Delirium is positive when Features 1 AND 2 are both present, PLUS either Feature 3 OR Feature 4 is present. This replicates the validated CAM algorithm in abbreviated form. A negative screen requires absence of Feature 1 or Feature 2.
A positive bCAM prompts immediate delirium workup: identify and treat precipitating causes (infection, medications, metabolic disturbance, pain), activate non-pharmacological delirium care bundles, consider specialist consultation, and initiate serial monitoring.
Emergency Physicians & Nurses
bCAM was specifically developed for emergency medicine workflows where rapid delirium identification is critical. Its 2-minute administration allows routine screening of all older adults presenting to the ED without significantly adding to assessment time.
Hospital Medical & Nursing Teams
Use bCAM for twice-daily nursing delirium rounds in high-risk ward populations including post-surgical patients, patients with dementia, and those with severe medical illness. Early detection enables faster activation of delirium care pathways.
Surgical & Anesthesia Teams
Administer bCAM in the post-operative recovery unit and on surgical wards to detect post-operative delirium, which is associated with increased complications, prolonged hospital stay, and long-term cognitive decline.
Step-Down Unit & HDU Teams
When transferring patients from ICU to step-down or general wards, use bCAM to establish cognitive baseline and detect delirium persistence or new-onset delirium outside the intensive care setting.
Nursing & Allied Health Staff
Use bCAM results to communicate clearly with family members about acute confusional states. A documented positive screen supports family understanding of delirium as a medical emergency requiring treatment rather than a behavioral problem.
Feature 1 (acute onset and fluctuating course) requires comparison to the patient's baseline mental status. Always obtain collateral from family, carers, or prior nursing notes. This feature cannot be reliably assessed from a single cross-sectional observation.
For Feature 2 (inattention), use a standardized test: ask the patient to say the months of the year backward or perform a forward digit span of 5. Casual conversation is insufficient—patients with delirium may appear conversational but fail formal attention tests.
Delirium fluctuates—a patient assessed as negative at 8am may be positive at 3pm. In high-risk patients, perform bCAM at least twice per shift and document any fluctuation pattern as this itself is diagnostically significant.
bCAM requires verbal responses for the disorganized thinking feature. For non-verbal patients, use CAM-ICU with the validated visual attention task and non-verbal assessments. Applying bCAM to non-verbal patients risks false-negative results.
Hypoactive delirium (quiet, withdrawn, lethargic presentation) is frequently missed by brief screens. If nursing staff or family report behavioral change but bCAM is negative, extend assessment and consider the NEECHAM or DRS-R98 for fuller characterization.
Record bCAM results with time stamps on each assessment. Serial documentation allows identification of delirium resolution and informs handover. A patient improving from positive to negative over 24-48 hours reflects treatment response.
A positive bCAM should always trigger a structured delirium cause search: sepsis screen, medication review (anticholinergics, opioids, benzodiazepines), fluid and electrolyte check, urinalysis, chest exam, pain assessment, and bowel/bladder review.
Inter-rater reliability for bCAM is highest when all staff use the same standardized administration script. Brief 15-minute training modules improve accuracy significantly. Include bCAM in nursing orientation programs for medical and surgical wards.
bCAM has published validation in acute-care populations as an efficient delirium detection strategy.
Positive bCAM indicates probable delirium signal requiring further diagnostic confirmation and treatment.
Use in fast-paced acute-care settings when rapid delirium triage is needed.
Binary screening can miss nuance; performance depends on assessor training and patient communication ability.
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.
April 21, 2026 · trust-baseline
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Screen for delirium using the CAM (Confusion Assessment Method). Gold standard with ~94% sensitivity and ~89% specificity. Requires acute onset + inattention, plus disorganized thinking or altered consciousness.
OpenEmergencyScreen ICU patients for delirium using the CAM-ICU algorithm (acute/fluctuating change, inattention, consciousness, disorganized thinking).
OpenGeriatricsRapid delirium screening tool scored 0-12; scores of 4 or more suggest possible delirium.
OpenGeriatricsA 2-item ultra-brief delirium screen where any failed item suggests possible delirium.
Open