Standard BP. Left or right?

The standard blood pressure should be measured with the left hand and right hand together, and the side with the higher value shall prevail.

Under normal circumstances, the blood pressure of both arms of the human body is different. Generally, the systolic blood pressure difference shall be within 20 mmHg, and the diastolic blood pressure difference shall be within 10mmHg, and the measurement value of the side

with the higher value shall prevail.