Author

Daniel Hofstedt DO Mercy Radiology Group Musculoskeletal and general private practice radiologist in California, focused on creating open-access radiology resources that emphasize clarity, efficiency, and practical application to support education and practice in the field.

NASCET Calculator

Clinical calculator for NASCET (North American Symptomatic Carotid Endarterectomy Trial) carotid stenosis assessment. Calculates percentage stenosis using standardized NASCET methodology: (1 - stenosis diameter ÷ distal diameter) × 100. Provides severity classification (mild <50%, moderate 50-69%, severe ≥70%) for clinical decision-making and surgical intervention planning.

Tool Categories

US Vascular Calculator Carotid Arteries

NASCET Calculator

Clinical calculator for NASCET (North American Symptomatic Carotid Endarterectomy Trial) carotid stenosis assessment. Calculates percentage stenosis using standardized NASCET methodology: (1 - stenosis diameter ÷ distal diameter) × 100. Provides severity classification (mild <50%, moderate 50-69%, severe ≥70%) for clinical decision-making and surgical intervention planning.

NASCET Carotid Stenosis Calculator - Clinical Measurement Tool

Clinical calculator for NASCET (North American Symptomatic Carotid Endarterectomy Trial) carotid stenosis assessment. Calculates percentage stenosis using standardized NASCET methodology: (1 - stenosis diameter ÷ distal diameter) × 100. Provides severity classification (mild <50%, moderate 50-69%, severe ≥70%) for clinical decision-making and surgical intervention planning.

NASCET standardized stenosis calculation Severity classification (mild/moderate/severe) Surgical intervention guidance Real-time diameter-based assessment
NASCET, carotid stenosis, vascular imaging, duplex ultrasound, CT angiography, MR angiography, carotid endarterectomy, stroke prevention
mm
mm

NASCET Formula

(1 - stenosis ÷ distal) × 100

Example Calculation:

Distal diameter: 5.0mm, Stenosis diameter: 1.0mm

Result: (1 - 1.0 ÷ 5.0) × 100 = 80% stenosis

Clinical Reference

. Beneficial effect of carotid endarterectomy in symptomatic patients with high-grade carotid stenosis. N Engl J Med . ; 325(7):445-453. doi:10.1056/NEJM199108153250701