The variation may be due to improper cuff placement, or by movement or talking during the test. This may also indicate the need for the manometer to be calibrated. Please also note that it is normal for one’s blood pressure to slightly change throughout the day within normal ranges. Additionally, as with the usual instructions, avoid exercising, taking baths/showers, and caffeine 15-30 mins before the test, as these may also affect the validity of the results.