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The low point is referred to as diastole and occurs when the ventricles relax and minimal pressure is exerted against the vessel wall. A normal blood pressure for a healthy adult ranges from 90 to 120 mm Hg systolic and from 60 to 80 mm Hg diastolic. Under normal circumstances, blood volume remains constant at 5,000 mL.
1 Normal blood pressure is below 120/80 mm Hg. 2  Prehypertension blood pressure (120 to 139 systolic or 80 to 89 diastolic) indicates an increased risk for developing high blood pressure. 3  High blood pressure (hypertension) is greater than or equal to 140 mm Hg (systolic) or greater than or equal to 90 mm Hg (diastolic).octors may also categorize hypertension based on what portion of the blood pressure reading is abnormal: 1  Isolated systolic hypertension occurs when systolic pressure is high (over 139 mm Hg) but diastolic pressure is normal (under 90 mm Hg).