CHA₂DS₂-VASc Stroke Risk Calculator
Quick answer: The CHA₂DS₂-VASc score predicts stroke risk in non-valvular atrial fibrillation. Higher scores indicate greater annual stroke risk and may inform anticoagulation decisions.
CHA₂DS₂-VASc Stroke Risk Calculator
Interpretation (annual stroke risk)
- 0: 0.2% — anticoagulation generally not indicated (males)
- 1: 0.6% — consider anticoagulation
- 2: 2.2% — anticoagulation recommended
- 3: 3.2%
- 4: 4.8%
- 5: 7.2%
- 6: 9.7%
- 7: 11.2%
- 8: 10.8%
- 9: 12.2%
Source: Lip GY, Nieuwlaat R, Pisters R, et al. Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation. Chest. 2010;137(2):263-72.
Frequently asked questions
Who is the CHA2DS2-VASc score for?
It is intended for adults with non-valvular atrial fibrillation (AF) to estimate stroke risk and inform decisions about anticoagulation. It is not validated for valvular AF, mechanical heart valves, or non-AF stroke risk.
What score warrants anticoagulation?
Most major guidelines (ESC, AHA/ACC) recommend anticoagulation for males with score ≥2 and females with score ≥3. Score 1 (males) or 2 (females) is borderline — patient preferences and bleeding risk matter.
How is bleeding risk balanced against stroke risk?
The HAS-BLED score is commonly used to estimate bleeding risk on anticoagulation. A high HAS-BLED doesn't automatically rule out anticoagulation — it identifies modifiable risks (uncontrolled BP, alcohol use) and patients who need closer monitoring.
What anticoagulants are typically used?
DOACs (apixaban, rivaroxaban, dabigatran, edoxaban) are now first-line for most patients with non-valvular AF, replacing warfarin. Choice depends on renal function, drug interactions, cost, and patient factors.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.