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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 blood pressure is quick and painless. Usually, the procedure involves using either a sphygmomanometer or a blood pressure machine. Blood pressure is measured in millimeters of mercury (mmHg) and recorded as two numbers -- systolic pressure over diastolic pressure.For example, the doctor or nurse might say 130 over 80 as a blood pressure reading. This is written as 130/80.easuring blood pressure is quick and painless. Usually, the procedure involves using either a sphygmomanometer or a blood pressure machine. Blood pressure is measured in millimeters of mercury (mmHg) and recorded as two numbers -- systolic pressure over diastolic pressure.