When measuring BP, which option best describes cuff sizing?

• A. Use a standard small cuff
• B. Use cuff that matches arm circumference and ensure the cuff bladder encircles the arm; if not feasible, measure on the opposite arm or use an appropriately sized alternative site per device guidance
• C. Inflate to 300 mmHg
• D. Take measurement on the other arm

Answer: (B)

Choosing a cuff that matches the person’s arm and making sure the cuff bladder encircles the arm is essential for accurate blood pressure readings. When the cuff is the right size, it fits snugly around the arm and the bladder covers about 80% of the arm’s circumference, so the pressure you measure reflects the true arterial pressure rather than being distorted by a too-tight or too-loose cuff. If the ideal size isn’t available, the guidance is to measure on the other arm or use an appropriately sized alternative site per the device’s instructions, rather than guessing with a wrong-sized cuff.

Using a standard small cuff isn’t reliable for most adults because it tends to squeeze too tightly, which can falsely raise the reading. Inflating to 300 mmHg is unsafe and unnecessary; you inflate only enough to surpass the systolic pressure, staying within the device’s recommended range. Taking the measurement on the other arm doesn’t address cuff fit and still may yield an inaccurate result if the first arm’s cuff size was inappropriate.