A Practical Guide to Haemostasis

Estimating the Risk of Stroke in Atrial Fibrillation [AF]:
The CHADS2 Score


The CHADS2 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.

The CHADS2 score has been replaced by the CH2ADS2-VASc score.

CHADS2 Score:

The criteria that comprise the CHADS2 score are summarised below:

[C] Congestive Heart Failure
1 Point
[H] Hypertension [Hypertension of any severity]
1 Point
[A] Age ≥ 75 years
1 Point
[D] Diabetes
1 Point
[S2] Prior Stroke or TIA or Thromboembolism
2 Point


[Max score 6 points]

CHADS2 Score Annual Stroke Risk
0 1.9 %
1 2.8%
2 4.0%
3 5.0%
4 8.5%
5 12.5%
6 18.2%

CHADS2 Score Stroke Risk
≥2 High
1 Moderate
0 Low

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