LAMS (Los Angeles Motor Scale, LVO prediction)
Los Angeles Motor Scale (Llanes 2004 / Nazliel 2008): facial droop (0-1), arm drift (0-2), grip strength (0-2); sum 0-5, >= 4 suggests a large-vessel occlusion.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Facial droop
- 1
- Arm drift
- 2
- Grip strength
- 2
Result: LAMS 5 of 5: LVO is likely (>=4 per Nazliel 2008). Consider transport to a comprehensive stroke center / thrombectomy-capable facility per local protocol.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0-3
- LVO less likely on the LAMS threshold; continue stroke workup per local protocol.
- 4-5
- LVO likely (Nazliel 2008 sensitivity 81% / specificity 89%). Consider transport to a comprehensive / thrombectomy-capable stroke center per local protocol.
What you enter
- Facial droop (0-1)
- Arm drift (0-2)
- Grip strength (0-2)
How this is calculated
Llanes JN, Kidwell CS, Starkman S, et al. The Los Angeles Motor Scale (LAMS). Prehosp Emerg Care. 2004;8(1):46-50. LVO threshold: Nazliel B, Starkman S, Liebeskind DS, et al. A brief prehospital stroke severity scale identifies LVO. Stroke. 2008;39(8):2264-2267. Read the sources: Llanes 2004 ↗, Nazliel 2008 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.