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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).
Video: How to measure blood pressure using an automatic monitor. To monitor your blood pressure using an automatic blood pressure monitor, find a comfortable place to sit with good back support at a table or desk.When you're ready to take your blood pressure, sit quietly for three to five minutes beforehand.o monitor your blood pressure using an automatic blood pressure monitor, find a comfortable place to sit with good back support at a table or desk.