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| Letter | Clinical characteristic | Points |
| H | Hypertension | 1 |
| A | Abnormal renal and liver function (1 point each) | 1 or 2 |
| S | Stroke | 1 |
| B | Bleeding | 1 |
| L | Labile INRs | 1 |
| E | Elderly | 1 |
| D | Drugs or alcohol (1 point each) | 1 or 2 |
INR: international normalized ratio.
