A healthy blood pressure is in the range 90/50 to 120/80. Blood pressure varies throughout the day and your levels of physical exertion and stress cause it to change, too. So blood pressure should be checked under resting conditions. Single measurements aren’t particularly meaningful. A diagnosis of high blood pressure (hypertension) isn’t normally made unless a high reading is measured on three separate occasions – usually over three months.
If an underlying medical condition causes hypertension, you’ll need to treat this condition to maintain a healthy blood pressure. For example, people with sleep apnea tend to develop high blood pressure. Treatment of sleep apnea with a CPAP machine can help to lower your high blood pressure due to sleep apnea. Another example is high blood pressure associated with obesity that improves after weight loss.

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Most doctors do not make a final diagnosis of high blood pressure until they measure your blood pressure several times (at least 2 blood pressure readings on 3 different days). Some doctors ask their patients to wear a portable machine that measures their blood pressure over the course of several days. This machine may help the doctor find out whether a patient has true high blood pressure or what is known as “white-coat hypertension.” White-coat hypertension is a condition in which a patient’s blood pressure rises during a visit to a doctor when anxiety and stress probably play a role.
A blood pressure reading measures both the systolic and diastolic forces, with the systolic pressure listed first. The numbers show your pressure in units of millimeters of mercury (mm Hg)—how high the pressure inside your arteries would be able to raise a column of mercury. For example, a reading of 120/80 mm Hg means a systolic pressure of 120 mm Hg and diastolic pressure of 80 mm Hg.