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How To Take Blood Pressure. The patient should sit or lie comfortably. The arm should be fully supported on a flat surface at heart level. (If the armâs position varies, or is not level with the heart, measurement values obtained will not be consistent with the patientâs true blood pressure).
Measuring your blood pressure at home and keeping a record of the measurements will show you and your doctor how much your blood pressure changes during the day. Your doctor can use your record of measurements to see how well your medicine is working to control your high blood pressure. Rest for 3 to 5 minutes before measuring your blood pressure. 2  Do not talk. 3  Sit in a comfortable position, with your legs and ankles uncrossed and your back supported. 4  Place your left arm, raised to the level of your heart, on a table or a desk, and sit still.