Consider the following statements regarding the process of measuring blood pressure:
- The arm should be kept below the level of the heart while measuring blood pressure.
- Systolic pressure is always higher than diastolic.
- Blood pressure can change at different times during the day.
Which of the above statements are correct?
Correct answer: C
Explanation
Systolic pressure is by definition higher than diastolic (2), and readings genuinely vary across the day with activity, stress and rest (3). Statement 1 is wrong because the arm should rest at heart level, not below it, since a low arm position falsely raises the reading.