Why does sex (female) add a point?

In Friberg 2012, female sex independently increased stroke risk in AF after age 65. ESC retains this; some guidelines now treat it as a risk modifier (don't treat at score 1 if only point is sex).

CHA₂DS₂-VASc 0 — anticoagulate?

Generally no in either sex per ESC/AHA. Annual stroke risk ~0.2% — anticoagulation harm > benefit.

Score 1 (men) / 2 (women)?

ESC 2024: "may be considered" — case-by-case after bleeding-risk assessment. AHA 2023 similar.

Difference vs. CHADS₂?

Original CHADS₂ (Gage 2001) had 5 components. CHA₂DS₂-VASc adds vascular disease, age 65-74 (instead of just ≥75), and female sex — better discrimination of "low risk" patients.

Is this medical advice?

No. AF stroke prevention requires HAS-BLED + clinical context + shared decision.

CHA₂DS₂-VASc Score Calculator (Stroke Risk in AF)

Stroke-risk score in non-valvular atrial fibrillation. Lip 2010 Chest. ESC/AHA recommend OAC if score ≥2 (men) / ≥3 (women).

Result

CHA₂DS₂-VASc

Annual stroke risk ~0.2%. No OAC; reassess yearly.

CHF (+1)0
Hypertension (+1)0
Age (0/1/2)0
Diabetes (+1)0
Stroke/TIA (+2)0
Vascular disease (+1)0
Sex (female +1)0
Total0
Annual stroke risk0.2%
OAC recommendationNo OAC; reassess yearly

Score 0 — No OAC; reassess yearly

Your score

0 (annual stroke risk ~0.2%)

OAC threshold (male)

ESC 2024 / AHA 2023 AF guidelines.

≥ 2

Score 0 reference

~0.2%/year — anticoagulation harm > benefit

Pair with HAS-BLED

Bleeding-risk score must be weighed before OAC

Source: Lip GYH et al., "Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation." Chest 2010;137(2):263–72.

Not medical advice — Score is for non-valvular atrial fibrillation. Anticoagulation decisions require bleeding-risk assessment (HAS-BLED) and shared decision-making — not just this number.

Step-by-step

Sum: CHF 0 + HTN 0 + age 0 + DM 0 + stroke 0 + vascular 0 + sex 0 = 0.
Annual stroke risk: ~0.2% (Lip 2010; Friberg 2012 validation).
OAC: No OAC; reassess yearly.

How to use this calculator

Answer each clinical question.
Read CHA₂DS₂-VASc total + estimated annual stroke risk.
Pair with HAS-BLED for bleeding risk before deciding OAC.

About this calculator

CHA₂DS₂-VASc estimates annual stroke risk in non-valvular atrial fibrillation. Source: Lip GYH et al., "Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation using a novel risk factor-based approach: the Euro Heart Survey on AF." Chest 2010;137(2):263-72. Validated by Friberg L et al., Eur Heart J 2012;33:1500. Components: CHF (1), Hypertension (1), Age ≥75 (2), Diabetes (1), prior Stroke/TIA (2), Vascular disease (1), Age 65-74 (1), Sex female (1). Max 9. ESC 2024 / AHA 2023 AF guidelines: oral anticoagulation recommended at ≥2 (men) or ≥3 (women); consider at 1/2 respectively. **Not medical advice — bleeding risk (HAS-BLED) must be weighed.**