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Geriatrics · Internal Medicine

4AT Delirium Screening calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Alertness
AMT4 items answered correctly
Attention (months of the year backwards)

Result

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Clinical inputs

  • Alertness
  • AMT4 items answered correctly
  • Attention (months of the year backwards)
  • Acute change or fluctuating course

Primary source

Bellelli G et al. Validation of the 4AT, a new instrument for rapid delirium screening. Age Ageing. DOI: 10.1093/ageing/afu120. PMID: 25385777. Scope: 4AT total 0–12: alertness 0/4, AMT4 0–2, attention 0–2, acute change/fluctuation 0/4; ≥4 suggests possible delirium. (2014)

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