4AT
4 'A's Test
Domain
Cognitive
Items
4
Rater
Clinician-rated
Cutoffs
| Band | Score |
|---|---|
| Possible delirium | ≥4 |
| Impair only | 1–3 |
Diagnostic performance
Sensitivity
0.88
Specificity
0.88
AUC / note
0.93
Clinical notes
<2 min; no training; recommended NICE/SIGN delirium screen.
Cutoffs and performance figures are pooled or landmark estimates and vary by population and comparator. Use only with appropriate clinical training. Not a diagnostic algorithm.