Labelling someone hypertensive and starting medicines for life should not be a hasty decision. There are patients whose BP rises just by seeing the doctor. If it was possible to measure BP round the clock, it would help identify the variation in pressure and it, in turn, would help the doctor formulate a correct dose for the patient. Many blood pressure patients have a common query. How does the pressure vary during the day and the night? To monitor the pressure all through the day an ambulatory BP machine is used. Following are the details which the patients need to know about the Ambulatory BP monitoring: