The location of the lower extremity blood pressure measurement is usually in the popliteal fossa, which is where the calf meets the thigh and is called the popliteal fossa at the back of the knee. It needs to be tied with a cuff that is appropriately loose and tight. In addition, the patient should be quiet for 5-10 minutes before the measurement and avoid exercise as well as emotional excitement. Using the inflation bladder, inflate it quickly. The systolic pressure, or high pressure, is measured when the first sound is heard. The diastolic pressure, or low pressure, is when the sound gradually decreases or disappears. The blood pressure in the lower extremities is on average 20 mmHg higher than that in the upper extremities, so pay attention to the measurement to prevent hypertension.