CHA₂DS₂-VASc Score — Free Online Calculator
Criteria
Age ≥75 and Age 65–74 are mutually exclusive.
CHA₂DS₂-VASc Score
0
Low risk — anticoagulation generally not recommended
About This Calculator
The CHA₂DS₂-VASc score estimates stroke risk in patients with non-valvular atrial fibrillation (AF). It is recommended by major guidelines (ESC, AHA/ACC) to guide decisions about oral anticoagulation therapy. A higher score indicates greater stroke risk and stronger indication for anticoagulation.
Formula
Interpretation
| Score | Risk | Recommendation |
|---|---|---|
| 0 | Low | No anticoagulation |
| 1 | Low-moderate | Consider anticoagulation |
| ≥ 2 | Moderate-high | Anticoagulation recommended |
Frequently Asked Questions
What does the CHA₂DS₂-VASc score predict?
CHA₂DS₂-VASc predicts annual stroke risk in patients with non-valvular atrial fibrillation. It guides decisions about whether to initiate anticoagulation therapy. The acronym stands for Congestive heart failure, Hypertension, Age ≥75 (2 points), Diabetes, Stroke/TIA (2 points), Vascular disease, Age 65–74, and Sex category (female).
When should anticoagulation be started based on CHA₂DS₂-VASc?
Per current guidelines: score 0 in males or 1 in females — no anticoagulation needed. Score 1 in males or 2 in females — consider anticoagulation. Score ≥2 in males or ≥3 in females — anticoagulation is recommended (DOACs preferred over warfarin).
Why does female sex score 1 point in CHA₂DS₂-VASc?
Female sex is an independent stroke risk modifier in atrial fibrillation but is not considered a standalone risk factor. A female patient with no other risk factors (score of 1) does not require anticoagulation. The point for female sex only adds clinical significance when combined with other risk factors.
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⚠ Medical Disclaimer
This tool is for educational and informational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional for clinical decisions.