To ensure accurate BP readings when using a cuff, which is essential?

• A. Use proper cuff size and position
• B. Use any cuff as long as the patient is calm
• C. Inflate to a fixed high pressure regardless of arm size
• D. Measure over thick clothing to save time

Answer: (C)

Using the correct cuff size and proper placement is essential for accurate blood pressure readings. The cuff must encircle the arm with the bladder centered over the brachial artery and sit at heart level. If the cuff is too small, more pressure is needed to occlude the artery, which artificially elevates the reading. If the cuff is too large, the reading may appear lower than it truly is. Proper sizing and positioning ensure the cuff measures the true arterial pressure without distortion from arm shape, muscle tension, or incorrect level. Remember to measure on skin (or a very thin layer of clothing) with the arm supported and relaxed, and avoid inflating to a fixed high pressure that ignores arm size. Measuring over thick clothing or relying on calmness alone can introduce additional errors.