🧠 Los Angeles Motor Scale (LAMS)
UsePrehospital/ED triage for possible thrombectomy candidates.
StrataTotal ≥ 4 suggests possible large-vessel occlusion and may prompt routing toward endovascular-capable care pe…
LimitsScreening tool only — confirm LVO with vascular imaging. · Posterior-circulation strokes may score low despite severe deficit. · Use with time windows and transfer agreements, not as a solo triage r…
SourceLlanes JN, et al. Stroke 2004
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
- Who it is for
- Adults with suspected acute stroke when quantifying deficit and deciding reperfusion, or TIA when judging short-term risk.
- Who it is not for
- Do not use ABCD² to decide thrombolysis. No new stroke scale.
- Formula and variables
- NIHSS is the neurologic deficit; items stay as on this page. FAST-ED is a prehospital large-vessel screen. ABCD² is age, blood pressure, clinical features, duration, and diabetes, for TIA.
- Result → next step
- This scene links only to the three tools below: deficit and time window open the thrombolysis page. A positive large-vessel screen opens thrombectomy. Drugs after the acute phase open secondary prevention. Thrombolysis shows no number until weight, onset time, pregnancy, and recent anticoagulation are known. Anticoagulant-related intracranial bleeding goes to reversal and ICH management.No numeric dose until age, weight, renal function, and pregnancy are all known. Pregnancy is contraindication or caution only.Thrombectomy →
- Guideline
- China acute ischemic stroke guideline 2023
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
Methodology · worked example, guidelines & full notes
≥ 4 suggests LVO and possible thrombectomy benefit.
When to use
Prehospital/ED triage for possible thrombectomy candidates.
How it works
Facial droop (0–1) + arm strength (0–2) + grip (0–2); total 0–5. ≥ 4 suggests large-vessel occlusion.
Key points
- ≥ 4 suggests LVO and possible thrombectomy benefit.
- Fast and prehospital-friendly.
- Confirm with vascular imaging.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Facial droop | Absent (0) |
|---|---|
| Arm drift | Drifts down (1) |
| Grip strength | Weak grip (1) |
→LAMS2/5
- Interpretation：< 4 — lower likelihood of LVO.
| Facial droop | Absent (0) |
|---|---|
| Arm drift | Absent (0) |
| Grip strength | Normal (0) |
→LAMS0/5
- Interpretation：< 4 — lower likelihood of LVO.
Verification & sources · governance
FAQ
Frequently asked questions
- Does Los Angeles Motor Scale (LAMS) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Los Angeles Motor Scale (LAMS) calculated in practice? Can you show a worked example?
- Inputs: Facial droop Absent (0), Arm drift Drifts down (1), Grip strength Weak grip (1) → Result: LAMS 2 /5（Interpretation: < 4 — lower likelihood of LVO.） Inputs: Facial droop Absent (0), Arm drift Absent (0), Grip strength Normal (0) → Result: LAMS 0 /5（Interpretation: < 4 — lower likelihood of LVO.）