How should you measure BP if the patient has an IV line in one arm or an arm injury?

• A. Use the arm with the IV line and press over the IV site
• B. Use the same arm but around the IV site
• C. Use the opposite arm if permissible; avoid placing pressure over an IV site or injured limb; document the limb used
• D. Do not measure BP

Answer: (C)

Measuring BP requires a limb that can be compressed without affecting an IV or an injured area. Placing a cuff over an IV site can block or distort the IV flow and make the reading unreliable, while compressing an injured limb can be painful and may worsen the injury or cause local edema. The best approach is to use the opposite arm if there are no contraindications, and to avoid applying pressure over any IV site or the injured limb. It’s also important to document which limb was used so future measurements can be interpreted consistently and compared over time. If the opposite arm isn’t usable, seek guidance for an alternative site or method from the clinician.