In the very first measurement, the blood pressure should be measured on both arms. If there is a significant difference, subsequent measurements should be made on the arm where the highest value has been observed.
Apart from this particular case, it is generally advisable, as a convenience for self-measurement, to place the cuff on the left arm for the right-handed ones and vice versa. Once the side of the measurement has been selected, all measurements must be taken on the same arm.
Placement on left arm (red arrow pointing to the shoulder)
Placement on right arm (red arrow pointing to the hand)
The design and algorithm of the iHealth Feel Blood Pressure Monitor have been optimized for measurements on the left arm. To ensure the most accurate measurements on the right arm, we recommend that you reverse the orientation of the monitor (the red arrow should point to your hand).
*credit to Sylvain of iHealth Labs EU