CHA₂DS₂-VASc Calculator
Estimate stroke risk in patients with atrial fibrillation.
Results
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Annual Stroke Risk by CHA₂DS₂-VASc Score
| Score | Annual Stroke Risk (%) |
|---|---|
| 0 | ~0% |
| 1 | ~1.3% |
| 2 | ~2.2% |
| 3 | ~3.2% |
| 4 | ~4.0% |
| 5 | ~6.7% |
| 6 | ~9.8% |
| 7 | ~9.6% |
| 8 | ~6.7% |
| 9 | ~15.2% |
CHA₂DS₂-VASc Calculator FAQs
The CHA₂DS₂-VASc score is a clinical tool used to estimate the risk of stroke in patients with atrial fibrillation (AF). It helps guide decisions about anticoagulation therapy.
C = Congestive heart failure (1 point)
H = Hypertension (1 point)
A₂ = Age ≥ 75 years (2 points)
D = Diabetes mellitus (1 point)
S₂ = Stroke/TIA/thromboembolism (2 points)
V = Vascular disease (1 point)
A = Age 65–74 years (1 point)
Sc = Sex category (female, 1 point)
H = Hypertension (1 point)
A₂ = Age ≥ 75 years (2 points)
D = Diabetes mellitus (1 point)
S₂ = Stroke/TIA/thromboembolism (2 points)
V = Vascular disease (1 point)
A = Age 65–74 years (1 point)
Sc = Sex category (female, 1 point)
It is used to identify atrial fibrillation patients at higher risk of stroke and determine whether anticoagulation therapy should be considered or recommended.
A score of 0 in men or 1 in women is usually considered low risk, and anticoagulation is often not recommended in these cases.
Generally, a CHA₂DS₂-VASc score of 2 or higher indicates a high enough risk that anticoagulation should be considered unless contraindicated.
Yes, being female adds 1 point, but this factor alone without other risk conditions does not necessarily mean anticoagulation is needed.
Annual stroke risk increases with higher scores. For example: 1 point ≈ 1.3%, 2 points ≈ 2.2%, 5 points ≈ 6.7%, 9 points ≈ 15%.
No. The calculator is an educational tool. Final treatment decisions should always be made by a qualified healthcare provider.
Yes, it is widely used across the world and recommended in European and American guidelines for atrial fibrillation management.
No. All calculations are performed locally in your browser. Nothing is saved or transmitted anywhere.