CHA2DS2-VASc score
CHA2DS2-VASc stratifies stroke and thromboembolism risk in atrial fibrillation, on a 0 to 9 scale. The score supports guideline anticoagulation decisions but does not replace the clinician judgement.
CHA2DS2-VASc score
Enter the values to see the result.
This tool assists calculation. It does not replace clinical judgement and is not a treatment instruction. Check against your institution protocol, reference ranges, and prescribing information. Clinical decisions belong to the treating clinician.
Interpreting the result
- Low risk — Score 0 (male).
- Low to intermediate risk
- Higher risk — Score 2 or more. Anticoagulation decisions per guideline belong to the clinician.
Formula
Heart failure 1, hypertension 1, age ≥75 is 2, diabetes 1, stroke/TIA/thromboembolism 2, vascular disease 1, age 65 to 74 is 1, female sex 1. Maximum 9 points.
Frequently asked questions
What score needs anticoagulation?
The recommended threshold varies by guideline and patient context. The score is a support tool; the decision to prescribe anticoagulation belongs to the treating clinician.
Why does female sex score a point?
Female sex is a risk modifier in the score. Many guidelines treat female sex alone, without other factors, as low risk.