Which arm should be used for BP measurement across visits to improve consistency?

• A. The same arm each time
• B. The arm with the larger circumference
• C. The right arm only
• D. The arm that is closer to the heart rate

Answer: (A)

Using the same arm for BP measurements on all visits improves consistency because there can be small differences in blood pressure between arms. By sticking with one arm, you reduce this source of variability, so changes you see over time reflect true changes in blood pressure rather than differences from one arm to the other. If you ever can’t use the same arm due to a medical reason, switch to the other arm and document it, but otherwise keep using the same arm at every visit. If an initial inter-arm difference is noticed, follow guidelines for validation and still aim to maintain consistency by using the same arm going forward.