ROSIER scale

Determine which patients are likely to have true stroke vs stroke mimics

The global unit selector only affects unanswered questions
1.Is blood glucose less than 3.5 mmol/L?
2.Has there been loss of consciousness or syncope?
3.Has there been seizure activity?
4.Is there new onset asymmetric facial weakness?
5.Is there new onset asymmetric arm weakness?
6.Is there new onset asymmetric leg weakness?
7.Is there new onset speech disturbance?
8.Is there new onset visual field defect?
Created by

1. Is blood glucose less than 3.5 mmol/L?

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About this Calculator

The Recognition of Stroke in the Emergency Room (ROSIER) scale was created by Nor et al in 2005, first published in Lancet Neurology. It was created to aid first-line ER providers in determining which patients were likely experiencing a stroke, thus expediting referral to an acute stroke team. When compared to similar scales, such as the FAST, the ROSIER scale had greater sensitivity in acute stroke recognition.


Nor AM, Davis J, Sen B, Shipsey D, Louw SJ, Dyker AG, Davis M, Ford GA.

The Recognition of Stroke in the Emergency Room (ROSIER) scale: development and validation of a stroke recognition instrument.

Lancet Neurology 2005, 4 (11): 727-34

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