CHADS2 Score for AF

Assess risk of stroke in atrial fibrillation

The global unit selector only affects unanswered questions
1.Heart Failure or EF ≤ 35%?
4.Diabetes Mellitus?
5.Stroke,TIA or Systemic Emboli?
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1. Heart Failure or EF ≤ 35%?

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About this Calculator

Warfarin anticoagulation titrated to an INR of 2.0-3.0 is recommended for the average patient with a CHADS2 score ≥2 unless contraindicated (e.g., history of frequent falls, clinically significant bleeding, inability to obtain regular INR). Either Warfarin or Aspirin can be used for the average patient with a CHADS2 score of 1 depending on physician discretion and patient preference. Aspirin 325 mg daily is recommended for the average patient with a CHADS2 score of 0.


Gage BF, van Walraven C, Pearce L, et al.

Selecting patients with atrial fibrillation for anticoagulation: stroke risk stratification in patients taking aspirin.

Circulation 2004 October 19, 110 (16): 2287-92

Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ.

Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation.

JAMA: the Journal of the American Medical Association 2001 June 13, 285 (22): 2864-70

Go AS, Hylek EM, Chang Y, Phillips KA, Henault LE, Capra AM, Jensvold NG, Selby JV, Singer DE.

Anticoagulation therapy for stroke prevention in atrial fibrillation: how well do randomized trials translate into clinical practice?

JAMA 2003 November 26, 290 (20): 2685-92

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