AFib Stroke Risk Calculator

CHA2DS2-VASc is a validated 8-criteria score that estimates annual stroke risk in people with non-valvular atrial fibrillation. It was published in Chest in 2010 (Lip et al.) and is now the score referenced by the AHA/ACC/HRS and European Society of Cardiology guidelines to help decide whether anticoagulation (blood thinners) is appropriate.

No. CHA2DS2-VASc is a risk-stratification score, not a diagnostic test, and it only applies if you already have a confirmed diagnosis of non-valvular atrial fibrillation — it cannot detect or diagnose atrial fibrillation itself. A cardiologist diagnoses AF using an ECG or similar monitoring, separate from this score.

Under the 2019 AHA/ACC/HRS guideline, a score of 2 or more in men, or 3 or more in women, generally supports anticoagulation. A score of 1 in men (or 2 in women from sex plus one other factor) is an intermediate zone where anticoagulation may be considered after discussion with a cardiologist. A score of 0 in men, or 1 in women from the sex-category point alone, generally does not warrant anticoagulation. This score only measures stroke risk — the actual decision also depends on your individual bleeding risk.

Being female is an independent risk factor for stroke in atrial fibrillation, so it contributes 1 point to the score. However, current guidelines are explicit that female sex alone — a score of 1 coming only from that item — is not by itself an indication for anticoagulation. The sex-category point only meaningfully changes management when combined with at least one other risk factor.

No. This tool only estimates stroke risk. A real anticoagulation decision also requires weighing your bleeding risk (commonly with a score like HAS-BLED), your kidney function, other medications, and your personal preferences — all of which need a cardiologist's individualized judgment. Always discuss your score and any treatment decision with a qualified healthcare provider.