How many readings are recommended and how should they be averaged?

• A. Take at least two readings 1–2 minutes apart and use the average of the last two; if the first reading is elevated, take a third and average the last two.
• B. Take a single reading after a brief rest.
• C. Take four readings and average all four.
• D. Take readings as quickly as possible.

Answer: (D)

Reliable blood pressure assessment depends on more than a single measurement. After a brief rest, take at least two readings spaced about one to two minutes apart. Then use the average of those last two readings. If the first reading is higher, take a third measurement and average the last two readings. This approach helps cancel out random fluctuations from anxiety, cuff technique, and natural BP variability, giving a more accurate estimate of the patient’s true pressure. Taking only one reading is not reliable, and rushing through measurements or averaging many readings without allowing for proper rest can still produce misleading results.