ROSIER (Recognition of Stroke in the Emergency Room)
Recognition of Stroke in the Emergency Room scale (Nor 2005).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Loss of consciousness / syncope
- No
- Seizure activity
- No
- New asymmetric facial weakness
- No
- New asymmetric arm weakness
- No
- New asymmetric leg weakness
- No
- Speech disturbance
- No
- Visual field defect
- No
Result: ROSIER 0: low probability of stroke on the ROSIER threshold (score <= 0 per Nor 2005). Investigate stroke mimics (seizure, syncope) but stroke is not fully excluded; use clinical judgment.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- <= 0
- Low probability of stroke on the ROSIER threshold. Investigate stroke mimics; stroke is not fully excluded.
- > 0
- Stroke is likely (Nor 2005 sensitivity 93% / specificity 83%). Activate the stroke pathway per local protocol.
What you enter
- Loss of consciousness / syncope (-1)
- Seizure activity (-1)
- New asymmetric facial weakness (+1)
- New asymmetric arm weakness (+1)
- New asymmetric leg weakness (+1)
- Speech disturbance (+1)
- Visual field defect (+1)
How this is calculated
Citation
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 Neurol. 2005;4(11):727-734. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.