When you have a blood pressure reading, the doctor will tell you two numbers: the SBP (systolic blood pressure) over the DBP (diastolic blood pressure). Use the following chart to compare your SBP and DBP numbers and classify your blood pressure. If your SBP and DBP fall into different categories, use the higher category. Note: mm Hg means millimeters of mercury.
| Category | SBP mm Hg | DBP mm Hg | |
|---|---|---|---|
| Normal | Less than 120 | and | Less than 80 |
| Prehypertension | 120–139 | or | 80–89 |
| High Blood Pressure | |||
| Stage 1 | 140–159 | or | 90–99 |
| Stage 2 | 160 or greater | or | 100 or greater |
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Source:http://www.dummies.com/how-to/content/blood-pressure-classifications.html
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