Classification Maximal Stenosis Interpretation Further Cardiac Investagation
CAD-RADS 0 0% No CAD None
CAD-RADS 1 1 – 24%* Minimal non-obstructive None
CAD-RADS 2 25 – 49% Mild non-obstructive None
CAD-RADS 3 50 – 69% Moderate stenosis Consider functional assessment
CAD-RADS 4 A: 70 – 99% or

B: Left Main >50% or 3-vessel ≥ 70%

Severe stenosis A: Consider ICA or functional assessment

B: ICA recommended

CAD-RADS 5 100% Total coronary occlusion Consider ICA and/or viability assessment
CAD-RADS N Non-diagnostic Obstructive CAD cannot be excluded Additional or alternative evaluation may be needed

CAD: Coronary Artery Disease; ICA: Invasive Cardiac Angiography

* Includes positive remodeling with no measurable stenosis



Cury, R. C., et al. (2016). “CAD-RADS: Coronary Artery Disease – Reporting and Data System.: An Expert Consensus Document of the Society of Cardiovascular Computed Tomography (SCCT), the American College of Radiology (ACR) and the North American Society for Cardiovascular Imaging (NASCI). Endorsed by the American College of Cardiology.” J Am Coll Radiol 13(2 Pt A): 1458 – 1466.