Clinical use
Use this calculator for rapid delirium screening tool in thecritical care workflow. It is decision support and should be interpreted with the patient context, local protocols, and clinician judgment.
Calculate 4AT
Interpretation
0 = delirium unlikely. 1-3 = possible cognitive impairment. ≥4 = possible delirium. Takes <2 min. Replaced CAM in many UK/AU hospitals.
Required inputs
- Alertness
- Amt 4
- Attention
- Acute Change Or Fluctuating
Evidence and limitations
This page cites 1 published reference. Confirm units and inclusion criteria before applying the output; calculators do not replace assessment, escalation, or local policy.
References
- Bellelli G et al. Age Ageing 2014;43:496-502
Frequently asked questions
What is the 4AT Delirium Score?
4AT Delirium Score is a clinical calculator used for Rapid delirium screening tool.
How do I interpret the 4AT Delirium Score?
0 = delirium unlikely. 1-3 = possible cognitive impairment. ≥4 = possible delirium. Takes <2 min. Replaced CAM in many UK/AU hospitals.
What inputs are required for the 4AT Delirium Score?
Required inputs include Alertness, Amt 4, Attention, Acute Change Or Fluctuating.
What is the evidence behind the 4AT Delirium Score?
The 4AT Delirium Score page cites Bellelli G et al. Age Ageing 2014;43:496-502.
Next steps
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