H: It stands for hypertension. If there is hypertension, add 1 minute; A: It refers to abnormal liver and kidney function. If there is abnormal liver function, add 1, if there is abnormal renal function, add 1. S: refers to stroke, that is, if the patient has a history of stroke, add 1.

B: It stands for bleeding. If there is a history of bleeding or patients with high risk factors for bleeding, 1 point should be added. L: stands for fluctuation of INR value, and e: stands for old age. If you are over 65 years old, you need to add 1 point; D: It refers to drugs, that is, using special drugs that affect warfarin, or drinking alcohol for a long time, and you need to add 1 point.