Prehypertension in children is diagnosed when average systolic or diastolic blood pressure levels are at least in the 90th percentile but less than the 95th percentile. For adolescents, as with adults, blood pressure readings greater than 120/80 are considered prehypertensive. Prehypertension is blood pressure between 120 and 139 for the top number, or between 80 and 89 for the bottom number. For example, blood pressure readings of 138/82, 128/89, or 130/86 are all in the prehypertension range.


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Blood pressure is measured in millimetres of mercury, which scientists shorten to mmHg. The two components of blood pressure, systolic and diastolic blood pressure, are considered normal when they are under 140 mmHg and 90 mmHg, respectively. Blood pressure is written with the systolic blood pressure first, followed by the diastolic blood pressure (for example 120/80). Blood pressure is the amount of force exerted on the artery walls by the pumping blood. High blood pressure (hypertension) means that your blood is pumping with more force than normal through your arteries.

Blood pressure is usually measured with a small portable instrument called a blood pressure cuff or the sphygmomanometer. The blood pressure cuff consists of an air pump, a pressure gauge, and a rubber cuff. Blood pressure is simply the pressure inside your blood vessels, both as your heart is pumping blood through the vessels and while the heart is relaxed. High and low blood pressure can cause health problems, so keeping your blood pressure at a proper level is essential to good long-term health. Blood pressure is measured in millimeters of mercury (written as mm Hg). For example, normal blood pressure in adults should be less than 120/80 mm Hg.