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
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.