When is anticoagulation usually recommended?

Generally, for men with a score of 1+ and women with a score of 2+, anticoagulation is considered to prevent stroke.

CHA2DS2-VASc Score – Stroke Risk in Atrial Fibrillation | CalcTools

Assess annual stroke risk for patients with AFib to guide anticoagulation therapy. Cardiology service.

Atrial fibrillation (AFib) creates a high risk for blood clots that can cause devastating strokes. However, blood-thinning medications (anticoagonants) carry their own risks of bleeding. The CHA2DS2-VASc score is the premier service for quantifying stroke risk, allowing doctors and patients to make evidence-based decisions about starting medication. By scoring comorbidities like heart failure, hypertension, and diabetes, this tool provides a clear annual risk percentage that serves as the foundation for modern stroke prevention.

Educational use only. This tool does not replace clinical judgment or local protocols.

Total Score

CHA₂DS₂-VASc Score: 0

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How it Works

The service assigns 1 point for most risk factors, with age ≥ 75 and prior stroke counting for 2 points each. The total score (0-9) correlates with a specific annual percentage risk of thromboembolism.

Calculation Formula

Sum of risk points

Calculation Examples

1. **High Risk**: Age 76, Htn, and Diabetes = **Score 4**.

Why use this tool in your daily life?

Informed prevention. This service transforms complex medical history into a simple, actionable risk score, enabling life-saving conversations between cardiologists and their patients.