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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).
Before Checking Your Blood Pressure. 1  Find a quiet place to check your blood pressure. 2  You will need to listen for your heartbeat. 3  Make sure that you are comfortable and relaxed with a recently emptied bladder (a full bladder may affect your reading). 4  Roll up the sleeve on your arm or remove any tight-sleeved clothing.