Geriatrics

4AT (Delirium Screen)

Rapid bedside test for delirium.

Education and reference only. Not a substitute for clinical judgement, local policy or product labelling. Always verify before clinical use. Values are calculated in your browser and never stored.

When to use

Use as a quick screen for delirium and cognitive impairment in acute and older-adult settings.

Why use

It needs no special training and detects delirium that is otherwise easily missed.

Advice

A score ≥4 suggests possible delirium and should prompt a delirium work-up (e.g. infection, drugs, retention, pain).

Evidence & references

Bellelli G et al. Validation of the 4AT, a new instrument for rapid delirium screening. Age Ageing. 2014.

About the creator

Bellelli G, MacLullich A et al.

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