The 4AT is a brief delirium assessment that takes less than 2 minutes to perform. The 4AT has four features: alertness, abbreviated mental test 4, attention, and acute change in mental status or fluctuating course. Points are assigned to each 4AT feature and are then totaled. In older medical inpatients, the 4AT is 90% sensitive and 84% specific for delirium when performed by a geriatrician (Bellelli et al. Age Aging. 2014).
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