Timing of measurement
Blood pressure fluctuates constantly during the course of a day. To ensure accuracy, the Japanese Society of Hypertension recommends taking blood pressure readings at about the same time everyday-preferably, soon after you get up in the morning and before you go to bed at night. In the morning, you should take a measurement within an hour after you get up. Make sure to empty your bladder before measuring your blood pressure. Avoid eating or taking medication before checking your blood pressure. I-or night time measurement, wait at least an hour after taking a bath.