Which action is a common measurement error that can raise blood pressure readings?

• A. Talking during measurement
• B. Reading while standing
• C. Not resting properly
• D. Wearing heavy clothing over the cuff

Answer: (C)

Not resting properly before taking a blood pressure reading is a common error because BP measurements assume the body is in a relaxed, resting state. When a person hasn’t rested, the sympathetic nervous system can stay activated from recent activity, raising heart rate and causing vasoconstriction. That combination pushes the cuff reading higher than the true resting BP, making this the most reliable source of artificially elevated results. For accuracy, the person should sit with back supported, feet uncrossed and flat, arm supported at heart level, and rest quietly for about five minutes before measuring. Other factors like talking during measurement or wearing heavy clothing over the cuff can also affect readings, but not resting properly is the most consistent source of elevation.