Cha2ds2 Vasc Score Calculator
Calculate CHA2DS2-VASc score for stroke risk stratification in atrial fibrillation patients. Enter values for instant results with step-by-step formulas.
Reviewed by Rahul Singh, Health & Wellness Specialist
Formula
CHA2DS2-VASc = CHF(1) + Hypertension(1) + Age≥75(2) + Diabetes(1) + Stroke/TIA(2) + Vascular(1) + Age 65-74(1) + Female(1)
Each risk factor adds points to the total. Age ≥75 and prior Stroke/TIA are weighted double (2 points each). Maximum score is 9. Higher scores indicate greater annual stroke risk and stronger indication for anticoagulation therapy.
Worked Examples
Example 1: Low Risk Assessment
Problem:65-year-old male with hypertension and no other risk factors.
Solution:Hypertension: +1\nAge 65-74: +1\nTotal CHA2DS2-VASc = 2\nAnnual stroke risk: 2.2%\nRecommendation: Oral anticoagulation recommended
Result:CHA2DS2-VASc 2 — Moderate-High Risk, anticoagulation recommended
Example 2: High Risk Assessment
Problem:78-year-old female with CHF, diabetes, and prior stroke.
Solution:CHF: +1\nAge ≥75: +2\nDiabetes: +1\nStroke: +2\nSex (female): +1\nTotal CHA2DS2-VASc = 7\nAnnual stroke risk: 11.2%\nRecommendation: Oral anticoagulation strongly recommended
Result:CHA2DS2-VASc 7 — High Risk, anticoagulation strongly recommended
Frequently Asked Questions
What is the CHA2DS2-VASc score?
The CHA2DS2-VASc score is a clinical prediction tool used to estimate stroke risk in patients with non-valvular atrial fibrillation (AF). It helps clinicians decide whether anticoagulation therapy is warranted. The acronym stands for: Congestive heart failure, Hypertension, Age ≥75 (doubled), Diabetes, Stroke (doubled), Vascular disease, Age 65-74, and Sex category (female). Scores range from 0 to 9, with higher scores indicating greater annual stroke risk.
How does CHA2DS2-VASc differ from CHADS2?
CHA2DS2-VASc is an updated version of the original CHADS2 score. It adds three additional risk factors: vascular disease, age 65-74, and female sex. This refinement better identifies truly low-risk patients (score 0) who may not need anticoagulation, while reclassifying many moderate-risk patients into higher risk categories warranting treatment.
What is the annual stroke risk for each score?
Approximate annual stroke rates: Score 0: 0.2%, Score 1: 0.6%, Score 2: 2.2%, Score 3: 3.2%, Score 4: 4.8%, Score 5: 7.2%, Score 6: 9.7%, Score 7: 11.2%, Score 8: 10.8%, Score 9: 12.2%. These percentages are derived from validation studies and represent adjusted stroke rates per year without anticoagulation.
References
Reviewed by Rahul Singh, Health & Wellness Specialist · Editorial policy