CHA₂DS₂-VASc Score for Atrial Fibrillation Stroke Risk
Calculate stroke risk score in patients with non-valvular atrial fibrillation to guide oral anticoagulation therapy.
CHA₂DS₂-VASc Score Calculator
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This calculator is for informational and educational purposes. Results should be interpreted with clinical judgment and local guidelines.
What is the CHA₂DS₂-VASc Score?
The CHA₂DS₂-VASc score is a clinical risk stratifications tool used to estimate the annual risk of ischemic stroke and systemic thromboembolism in patients with non-valvular atrial fibrillation (AF). Recommended by the European Society of Cardiology (ESC) and American College of Cardiology (ACC/AHA), it guides decisions on initiating oral anticoagulation (OAC) therapy.
CHA₂DS₂-VASc score ranges from 0 to 9. A score of ≥ 2 in men or ≥ 3 in women is a strong recommendation (Class I) for oral anticoagulation.
When to Use the CHA₂DS₂-VASc Calculator
- Newly diagnosed non-valvular atrial fibrillation or atrial flutter.
- Evaluating the need for oral anticoagulation (DOACs like Apixaban, Rivaroxaban, Dabigatran, or Warfarin).
- Re-evaluating stroke risk during annual cardiology or OPD follow-up visits.
- Pre-cardioversion risk assessment for atrial fibrillation.
CHA₂DS₂-VASc Scoring Criteria
Scoring Breakdown (Max Score: 9)
C (1) + H (1) + A₂ (2) + D (1) + S₂ (2) + V (1) + A (1) + Sc (1)
Example: Age 68 (1) + Hypertension (1) + Diabetes (1) = Score 3
Variables
C — Congestive Heart Failure (+1 point)
Signs/symptoms of heart failure or LVEF ≤ 40%
H — Hypertension (+1 point)
Resting BP > 140/90 mmHg or treated hypertension
A₂ — Age ≥ 75 years (+2 points)
Patient age 75 years or older
D — Diabetes Mellitus (+1 point)
Fasting glucose > 126 mg/dL or on antidiabetic therapy
S₂ — Stroke / TIA / Thromboembolism (+2 points)
Prior ischemic stroke, TIA, or systemic embolus
V — Vascular Disease (+1 point)
Prior MI, peripheral artery disease (PAD), or aortic plaque
A — Age 65–74 years (+1 point)
Patient age between 65 and 74 years
Sc — Sex Category (Female) (+1 point)
Female sex (note: female sex alone without other risk factors does not confer risk)
Points for Age ≥ 75 (+2) and Age 65–74 (+1) are mutually exclusive.
CHA₂DS₂-VASc Score Interpretation & Anticoagulation Guidelines
European Society of Cardiology (ESC 2020) & ACC/AHA Recommendations:
| Range | Classification | Health Risk |
|---|---|---|
| 0 (Male) / 1 (Female) | Low Stroke Risk | No anticoagulation required |
| 1 (Male) | Moderate Stroke Risk | Consider oral anticoagulation (Class IIa) |
| ≥ 2 (Male) / ≥ 3 (Female) | High Stroke Risk | Oral Anticoagulation Recommended (Class I) |
DOACs (Apixaban, Rivaroxaban, Edoxaban, Dabigatran) are preferred over Warfarin in eligible patients.
Limitations & Clinical Warnings
Applies ONLY to non-valvular atrial fibrillation. Patients with moderate-to-severe mitral stenosis or mechanical heart valves require Warfarin regardless of CHA₂DS₂-VASc score.
Female sex acts as a risk modifier, not an independent risk factor — a female with score 1 (sex alone) has low risk.
Always assess bleeding risk using HAS-BLED score alongside CHA₂DS₂-VASc before initiating anticoagulation.
Medical Disclaimer
This tool is for clinical guidance only. Anticoagulation decisions should involve patient preference and bleeding risk assessment.
References & Citations
- Lip GY, Nieuwlaat R, Pisters R, Lane DA, Crijns HJ. “Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation: the Euro Heart Survey on Atrial Fibrillation”. Chest. 2010. 137(2): 263-272. PMID: 19762550
- Hindricks G, Potpara T, Dagres N, et al.. “2020 ESC Guidelines for the diagnosis and management of atrial fibrillation”. European Heart Journal. 2021. 42(5): 373-498. DOI: 10.1093/eurheartj/ehaa612
Medically Reviewed
Reviewed by CliniqWise Cardiology Editorial Board · Last updated: 2026-08-27 · Next review: 2027-02-27
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