Measurement of blood pressure is not the same for the left and right arms, and the side with the higher reading will prevail.
At the first visit, the blood pressure of both upper arms should be measured, and the blood pressure result of the side with the higher reading should prevail, and later measurements also need to be taken on this side as the measuring arm. Measurement is usually done in a sitting position, and the upper arm should be placed at the same level as the heart. 2 consecutive measurements should be taken with an interval of 1 to 2 minutes, and if the difference between the 2 measurements is more than 5 mmHg, the measurement should be taken again, and the average of the 3 measurements should be taken.
For suspected postural hypotension, blood pressure should be measured after upright position, and standing blood pressure should be measured 1 minute and 3 minutes after changing from prone to standing position. If the blood pressure fluctuates greatly with multiple measurements, or if there is white coat hypertension, occult hypertension, or persistent refractory hypertension, ambulatory blood pressure monitoring is needed to assess the degree of blood pressure elevation, short-term variability, and circadian rhythms.
If you suspect that your blood pressure value is inaccurately detected, it is recommended that you seek prompt medical attention from a physician to determine the blood pressure value through a formal examination, so as not to delay or aggravate your condition.