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: 31 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

New landmark 4AT clinical implementation study

Involving over 18,000 patients with hip fracture, the completion rate for the 4AT was 91%.
A positive 4AT score (seen in 21% of patients) was predictive of key clinical outcomes, including mortality.
Conducted nationally across multiple hospitals.
Further confirms that the 4AT can be successfully implemented at scale in routine clinical practice.
Study: Delirium on presentation with a hip fracture is associated with adverse outcomes : a multicentre observational study of 18,040 patients using national clinical registry data. Penfold et al., Bone Joint Journal 2025 Apr 1;107-B(4):470-478.