Carotid Stenosis (NASCET / ECST) — free guideline decision tool
Compute extracranial carotid (ICA) stenosis from diameters using the NASCET method (optional ECST) with grade and management direction.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Common questions
What does Carotid Stenosis (NASCET / ECST) do?
Quantify carotid stenosis for revascularization decisions in symptomatic and asymptomatic disease.
How is the result calculated?
NASCET = (1 − A/B)×100, where A = narrowest residual lumen and B = distal normal ICA diameter. Mild < 50%, moderate 50–69%, severe ≥ 70%. ECST = (1 − A/C)×100 (C = original bulb diameter).
Is this a substitute for clinical judgement?
No. All results are decision-support only, for licensed clinicians. They must be individualized to the whole patient and the latest guideline version.
Run Carotid Stenosis (NASCET / ECST) now
Compute extracranial carotid (ICA) stenosis from diameters using the NASCET method (optional ECST) with grade and management direction.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.