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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).
Preparing to Check Your Blood Pressure. 1  1. Verify that you have the right cuff size. 2  2. Avoid factors that can increase blood pressure. 3  3. Find a quiet place.  4. Get 1  comfortable. 5. Remove tight sleeves.  6. Rest for 5 to 10 1  minutes. 7. Find a comfortable and appropriate location to take your blood pressure.