Typical causes for a single high BP reading include:

• A. Improper cuff size, recent activity, caffeine or nicotine; rest and re-measure with correct technique; use multiple readings
• B. Drinking water only
• C. Wearing tight clothing
• D. None of the above

Answer: (A)

A single high blood pressure reading is most often caused by temporary, modifiable factors that influence the measurement rather than a true, sustained hypertension. The best answer highlights several key contributors: using a cuff that is too small or placing it improperly can artificially raise the reading; recent activity, such as walking, exertion, or talking, can elevate BP temporarily; caffeine or nicotine can trigger a short-term rise in blood pressure. Resting and re-checking with correct technique, and taking multiple readings, helps distinguish a temporary spike from a real issue. This approach recognizes that measurement conditions greatly affect the result, which is why proper technique and multiple readings are essential before making any clinical judgments. Drinking water alone doesn’t typically cause a high reading in the context of a measurement, and while wearing very tight clothing can influence the result, the combination of improper cuff size, recent activity, and stimulants covers the main, common reasons for a single elevated value. None of the above isn’t correct because there are real, known factors that can produce a high reading.