Which action does not help reduce variation in BP readings across visits?

• A. Taking multiple measurements with no standard protocol
• B. Standardizing the protocol
• C. Using the same arm
• D. Ensuring proper cuff size

Answer: (D)

Reducing variation in BP readings across visits comes from measuring in a consistent, controlled way and with appropriate equipment. When the technique isn’t standardized, many factors—how long the patient rests, arm position, where the cuff is placed, and even subtle differences in how the cuff is inflated—can vary from one visit to the next, making readings less comparable. The best way to minimize this drift is to follow a standardized protocol so every measurement is done the same way each time. Using the same arm avoids differences that can occur between arms, since one arm can naturally read higher or lower than the other. Making sure the cuff size fits properly matters because a too-small cuff tends to overestimate BP and a too-large cuff can underestimate it, introducing variability and bias. So the action that does not help reduce variation is taking multiple measurements without a defined, standardized protocol.