A Practical Guide to Haemostasis

Estimating the Risk of Stroke in Atrial Fibrillation [AF]: The CHA2DS2-VASc Score


The CHA2DS2-VASc score is a clinical prediction rule for estimating the risk of stroke in patients with non-valvular Atrial Fibrillation [AF]. It is used to guide whether a particular patient may benefit from anticoagulation.  It is based on the CHADS2 score but includes three additional risk factors for stroke: Age 65-74; female sex and a history of vascular disease.  These additional risk factors are believed to more accurately predict the risk of stroke in patients with a with a CHADS2 score of 0 or 1and therefore, who may benefit from anticoagulation.

CHA2DS2-VAS Score:

The criteria that comprise the CHA2DS2-VASc score are summarised below:

[C] Congestive Heart Failure
1 Point
[H] Hypertension [Hypertension of any severity]
1 Point
[A2] Age
<65 yrs    0 Points
65-74 yrs 1 Point
≥ 75 yrs    2 Points
 [D] Diabetes
1 Point
[S2] Prior Stroke or TIA or Thromboembolism
2 Points
[V] Vascular Disease
1 Point
[Sc] Sex - Female
1 Point


[Max score 9 points]

CHA2DS2-VASc Score Stroke Risk [%]
0 0
1 1.3
2 2.2
3 3.2
4 4.0
5 6.7
6 9.8
7 9.6
8 12.5
9 15.2

CHA2DS2-VASc Score Stroke Risk
≥2 High
1 Intermediate
0 Low

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