Does Cuff Size Affect Blood Pressure?

Sheps, M.D. Using a blood pressure cuff that's too large or too small can give you inaccurate blood pressure readings. Your doctor's office should have several sizes of cuffs to ensure an accurate blood pressure reading. When you measure your blood pressure at home, it's important to use the proper size cuff.

Can a tight blood pressure cuff cause a high reading?

Most blood pressure reading errors are the result of improper sizing of the blood pressure cuff or placing the cuff over clothing. Improper placement of the cuff over clothing can cause your blood pressure measurement to increase 10 to 50 points. If the cuff is too small, it can add 2 to 10 points your reading.

What happens when you use a blood pressure cuff that is too big?

The most common error when using indirect blood pressure measuring equipment is using an incorrectly sized cuff. A BP cuff that is too large will give falsely low readings, while an overly small cuff will provide readings that are falsely high.