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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).
The best way to check your blood pressure is manually through trained medical personnel. The accuracy of automated electronic blood pressure machines can vary depending on the quality of the device. Some machines may need occasional calibration or maintenance too.