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CHA2DS2 Vasc Calculator

Estimate annual stroke risk in atrial fibrillation with CHA2DS2-VASc score and anticoagulation guidance.

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What Is CHA₂DS₂-VASc?

CHA₂DS₂-VASc is a clinical score that estimates stroke risk in patients with atrial fibrillation or flutter. It guides decisions about oral anticoagulation versus bleeding risk. Related tools: Heart Disease Risk Calculator, Blood Pressure Calculator, and Cardiac Output Calculator.

Score Components

  • Congestive heart failure: 1 point
  • Hypertension: 1 point
  • Age 65 to 74: 1 point; age 75 or older: 2 points
  • Diabetes mellitus: 1 point
  • Stroke, TIA, or thromboembolism: 2 points
  • Vascular disease: 1 point
  • Female sex: 1 point

Risk Stratification

Score 0 in men indicates low annual stroke risk and anticoagulation is generally not indicated. Score 1 in men is moderate risk where shared decision-making applies. Score 2 or higher in men, or score 2 or higher in women after accounting for female sex alone, supports anticoagulation unless bleeding risk dominates.

Clinical Use

CHA₂DS₂-VASc complements HAS-BLED and clinical judgment. It does not replace discussion of lifestyle, renal function, fall risk, and patient preferences when choosing anticoagulant therapy.

Frequently Asked Questions

Why does female sex add a point?

Women with atrial fibrillation have modestly higher thromboembolic risk in epidemiologic studies, so sex is included in the score.

What counts as vascular disease?

Prior myocardial infarction, peripheral artery disease, or aortic plaque are commonly included per guideline definitions.

Is CHA₂DS₂-VASc used for bleeding risk?

No. Use a bleeding score such as HAS-BLED alongside stroke risk assessment.

What annual stroke risk does score 0 carry?

Published cohorts report about 0.2% per year for men with score 0, though estimates vary by population.

Should every atrial fibrillation patient be anticoagulated?

Not automatically. Therapy depends on CHA₂DS₂-VASc, bleeding risk, and individual patient factors.

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