University of Iowa
Department
of Family Medicine
FPInfo: Resources to support patient care
General Clinical Resources - Clinical Scoring Instruments and Decision Rules
CHADS2 Score
CHADS2 Score for Atrial Fibrillation Stroke Risk
The CHADS2 score is a validated clinical prediction rule for determining the risk of stroke and who should be anticoagulated.
It assigns points (0-6) depending on the presence or absence of co-morbidities.
CHADS2 score
|
CHF Hx |
+1 |
|
HTN Hx |
+1 |
|
Age 75 or >75 yrs old |
+1 |
|
Diabetes Mellitus Hx |
+1 |
|
Stroke previously or TIA Hx |
+2 |
CHADS2 scores, stroke risk, and risk levels
|
CHADS2 score |
Stroke risk
|
CHADS2 risk level |
Anticoagulation recommended |
|
0 |
1.9 |
Low |
ASA |
|
1 |
2.8 |
Moderate |
ASA or Warfarin |
|
2 |
4.0 |
High |
Warfarin |
|
3 |
5.9 |
High |
Warfarin |
|
4 |
8.5 |
High |
Warfarin |
|
5 |
12.5 |
High |
Warfarin |
|
6 |
18.2 |
High |
Warfarin |
Source: Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ (2001). "Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation". JAMA 285 (22): 2864–70. PMID 11401607