CHA2DS2-VASc Score

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Use this calculator to calculate CHA2DS2-VASc score and risk of stroke in atrial fibrillation.

Heart Failure or Ejection Fraction ≤35%
Stroke, TIA or Systemic Emboli
Vascular disease (previous MI, peripheral arterial disease or aortic plaque)

 About this calculator

The CHA2DS2-VASc score can be considered an extension of the CHADS2 schema by considering additional stroke risk factors that may influence a decision whether or not to anticoagulate.  When compared to the CHADS2 score, CHA2DS2-VASc performed better in predicting patients at high risk, and those categorised as low risk by CHA2DS2-VASc were truly at low risk for thromboembolism.

Warfarin anticoagulation titrated to an INR of 2.0-3.0 is recommended for the average patient with a CHA2DS2-VASc score ≥2 unless contraindicated (e.g., history of frequent falls, clinically significant bleeding, inability to obtain regular INR).  Either Warfarin or Aspirin can be used for the average patient with a CHA2DS2-VASc score of 1 depending on physician discretion and patient preference.  Aspirin 325 mg daily is recommended for the average patient with a CHA2DS2-VASc score of 0.


QxMD Cardiology contributing author: Dr. Jason Andrade, MD, FRCP(C)


Olesen JB, Lip GY, Hansen ML, Hansen PR, Tolstrup JS, Lindhardsen J, Selmer C, Ahlehoff O, Olsen AM, Gislason GH, Torp-Pedersen C. Validation of risk stratification schemes for predicting stroke and thromboembolism in patients with atrial fibrillation: nationwide cohort study. BMJ. 2011 Jan 31;342:d124. PMID: 21282258.