Rapid delirium assessment
Evidence-based bedside assessment test for rapid delirium detection across acute, community, and peri-operative settings.
Recommended in the 2023 UK NICE delirium guideline · Free · No registration · <2 minutes
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~2 min administration time
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No training required: designed for immediate use by nurses, doctors, and AHPs
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Extensive evidence: 33 diagnostic‑accuracy studies (>6000 pts)
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High sensitivity & specificity
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Globally adopted: translated into >20 languages & included in national guidelines
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Completely free: instant access, no registration required
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Free EHR integration: ready for systems like EPIC with no licensing required
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Built-in cognitive testing: identifies possible cognitive impairment as well as delirium in a single assessment – supporting Age-Friendly Hospital ‘Mentation’ workflows and CMS 4Ms implementation. What the 4AT can, and cannot, indicate about possible dementia.
“Balancing the evidence for accuracy and cost effectiveness with the practicality of implementing the tests, the committee agreed that the 4AT was the best option for most settings.
It is among the most accurate of the tools reviewed, quick and simple to use, and has a broader range of evidence to support it.”
Free book
The 4AT Manual
Free digital download. Practical guidance on administering, scoring and using the 4AT.
New book · October 2026
Delirium (Acute Confusion): A Family Guide to Sudden Changes in Thinking and Memory
A resource to share
Help families understand delirium
Delirium Support is a free, plain-English website about delirium (sudden confusion) for families and carers. Share it during or after conversations about suspected or diagnosed delirium. It explains what delirium is, what families can do, and what recovery may be like, with one-page guides to print or download.
deliriumsupport.com · Free to use and share
<3 min video walkthrough of 4AT: see how easy it is!
More short videos on delirium and the 4AT: Think Delirium on YouTube