🚑 LAPSS (Los Angeles Prehospital Stroke Screen)
UseWhen to use: EMS destination triage for suspected large-vessel/hemispheric stroke.
StrataAll eligibility + asymmetry = positive → stroke pathway activation.
LimitsWhen not to use: to rule out atypical / posterior-circulation stroke. · Pitfall: treating failed eligibility as “not stroke”. · Local protocols may prefer CPSS/FAST/LAMS.
SourceKidwell CS et al. LAPSS
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
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Methodology · worked example, guidelines & full notes
Eligibility first.
When to use
When to use: EMS destination triage for suspected large-vessel/hemispheric stroke.
How it works
Age>45 + no seizure Hx + onset<24h + ambulatory baseline + glucose 60–400 + unilateral face/grip/arm asymmetry.
Key points
- Eligibility first.
- Asymmetry required.
- Next: CPSS / destination triage.
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.
| Age > 45 years | No |
|---|---|
| No history of seizures / epilepsy | No (has seizure history) |
| Symptom duration < 24 hours | No |
| Not wheelchair-bound / bedridden at baseline | No |
| Blood glucose 60–400 mg/dL (3.3–22.2 mmol/L) | No / out of range |
| Unilateral weakness asymmetry (face and/or grip and/or arm) | No |
→LAPSSScreen incomplete / not eligible
- Cue：Eligibility items not all met — still examine; do not exclude stroke solely on LAPSS
| Age > 45 years | Yes |
|---|---|
| No history of seizures / epilepsy | Yes (no seizure history) |
| Symptom duration < 24 hours | Yes |
| Not wheelchair-bound / bedridden at baseline | Yes |
| Blood glucose 60–400 mg/dL (3.3–22.2 mmol/L) | Yes |
| Unilateral weakness asymmetry (face and/or grip and/or arm) | Yes |
→LAPSSPositive
- Eligibility：Met
- Asymmetry：Present
Verification & sources · governance
FAQ
Frequently asked questions
- Does LAPSS (Los Angeles Prehospital Stroke Screen) 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 LAPSS (Los Angeles Prehospital Stroke Screen) calculated in practice? Can you show a worked example?
- Inputs: Age > 45 years No, No history of seizures / epilepsy No (has seizure history), Symptom duration < 24 hours No, Not wheelchair-bound / bedridden at baseline No, Blood glucose 60–400 mg/dL (3.3–22.2 mmol/L) No / out of range, Unilateral weakness asymmetry (face and/or grip and/or arm) No → Result: LAPSS Screen incomplete / not eligible（Cue: Eligibility items not all met — still examine; do not exclude stroke solely on LAPSS） Inputs: Age > 45 years Yes, No history of seizures / epilepsy Yes (no seizure history), Symptom duration < 24 hours Yes, Not wheelchair-bound / bedridden at baseline Yes, Blood glucose 60–400 mg/dL (3.3–22.2 mmol/L) Yes, Unilateral weakness asymmetry (face and/or grip and/or arm) Yes → Result: LAPSS Positive（Eligibility: Met, Asymmetry: Present）