How should you measure BP when the patient has edema or has a very large upper arm?

• A. Use a standard small cuff
• B. Use a large or extra-large cuff if available; ensure bladder covers arm circumference; if not feasible, measure on the opposite arm or use an appropriately sized alternative site per device guidance
• C. Measure on the leg
• D. Skip measurement

Answer: (B)

Accurate BP depends on the cuff fitting the arm correctly. When the arm is very large or edematous, a standard small cuff won’t encircle the arm properly, which can lead to falsely high readings. The best approach is to use a large or extra‑large cuff so the bladder fully covers the arm circumference. If a cuff that fits isn’t available, measure on the opposite arm or use an appropriately sized alternative site per the device’s guidance. Remember to place the cuff with its bladder centered over the brachial artery, keep the arm supported at heart level, and have the patient rest before measurement. Measuring on the leg is not routine unless the device specifically allows it.