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Once you have your average blood pressure, the next step is to see where the numbers fall. Generally, anything under 120/80 is considered a good blood pressure. Average numbers between 120/80 and 139/89 are considered prehypertension.. If the average of your numbers is more than 140/90, you have high blood pressure.
Blood pressure ideally is supposed to be between 100 to 120 systolic (top number) and 70 to 80 diastolic (bottom number). In reality, blood pressure readings should be taken in context, looking at the individual, their age, and what medical conditions they have.