4AT – 2 minute delirium detection validated in 30+ studies
Evidence-based bedside tool for rapid delirium screening across acute, community, and peri-operative settings.
~2 min administration time
No training required: designed for immediate use by nurses, doctors, and AHPs
Extensive evidence: 32 diagnostic‑accuracy studies (>6000 pts)
High sensitivity & specificity
Globally adopted: translated into >20 languages & included in national guidelines
Completely free: instant access, no registration required
Free EHR integration: ready for systems like EPIC with no licensing required
"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."
