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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).
How To Measure Blood Pressure, And What It All Means. Here are the tools: A Stethoscope and a Sphygmomanometer. Make sure you place the round end of the stethoscope 'under' the blood pressure cuff. You inflate the sphygmomanometer (blood pressure cuff) to a little above 180 mm Hg. This collapses the major arteries to the arm (that's why it is uncomfortable). Then you slowly release air by gently turning the air valve, and watch the pressure drop.