When there is uncertainty about cuff size, what is the best action to ensure accurate blood pressure measurement?

• A. Use the cuff with improper fit
• B. Use the cuff with proper fit and re-measure
• C. Use the smallest cuff only
• D. Skip measurement

Answer: (B)

Accurate blood pressure readings depend on using a cuff that fits the arm properly. If there’s any doubt about cuff size, the best action is to choose a cuff that fits the arm correctly and re-measure. When the cuff is too small, readings tend to be higher than the true pressure; when it’s too large, readings can appear lower. By selecting a properly fitting cuff and re-checking, you reduce this source of error and get a more reliable measurement.

Context that helps understanding: before measuring, check arm circumference and pick a cuff with a width about 40% of the arm and a bladder that encircles enough of the arm; ensure the patient is seated with the arm supported at heart level and the cuff placed over a bare upper arm with the artery beneath the cuff’s center.

Other choices don’t fit because using an improperly fitting cuff distorts the value, using the smallest cuff only tends to overestimate BP, and skipping measurement fails to provide any actionable data.