Which practice supports consistency across visits?

• A. Use the same arm for measurement on each visit
• B. Change arms with every visit
• C. Use different cuff types each time
• D. Take fewer measurements without rest

Answer: (A)

Using the same arm for blood pressure measurements on each visit keeps the measurement conditions consistent, which is essential for seeing true trends over time. Differences between arms exist due to anatomy and physiology, and those inter-arm variations can be several mmHg. If you switch arms, you introduce a new source of variability that can make a real change in blood pressure harder to detect. By sticking to one arm, the readings become comparable from visit to visit, so you can accurately monitor whether BP is rising, falling, or staying the same.

Other practices introduce more variability: changing arms adds inter-arm difference as a confounding factor; using different cuff types can alter cuff tightness and how the cuff fits, affecting the reading; taking fewer measurements without adequate rest reduces reliability and can distort the true value.