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Everyday health · 2 min

How Blood Pressure Categories Are Defined

Reviewed by Velantri physicians on October 27, 2026

Blood pressure is measured with two numbers. The first number is systolic pressure. It shows the force when the heart beats. The second number is diastolic pressure. It shows the force when the heart rests between beats. Both numbers matter when understanding what a reading means. Health guidelines from 2017 describe different categories for adults. These categories help people understand their readings. The categories are normal, elevated, stage 1, and stage 2. Normal blood pressure is below 120 systolic and below 80 diastolic. Both numbers need to be in this range for the reading to be normal. Elevated blood pressure is 120 to 129 systolic with diastolic below 80. The systolic number is higher than normal, but the diastolic is still in the normal range. Stage 1 is 130 to 139 systolic or 80 to 89 diastolic. Either number can move a reading into this category. Stage 2 starts at 140 systolic or 90 diastolic. Again, either number reaching this level places the reading in stage 2. When the two numbers fall into different categories, the higher category applies. For example, a reading of 135 over 78 would be stage 1 because the systolic number is in that range. A reading of 118 over 85 would also be stage 1 because the diastolic number is in that range. These categories are based on careful readings taken on more than one occasion. A single reading does not determine which category applies. Health professionals take multiple readings and use the average. This approach gives a more accurate picture over time. Understanding these categories can help people talk with their health team. The categories describe patterns, not single moments. They provide a framework for conversations about heart health. Each category reflects both the systolic and the diastolic measurement. When only one number is elevated, that elevated number determines the category. The systolic reading alone can place a measurement in a higher category even when diastolic remains normal. The same is true for diastolic pressure. If the diastolic number reaches the threshold for stage 1 or stage 2, the reading falls into that category. This dual system ensures that elevated pressure in either measurement is recognized. Elevated blood pressure sits between normal and stage 1. It signals that systolic pressure has risen above normal while diastolic has not. This combination can occur when the heart's pumping force increases but the resting pressure stays low. Stage 1 and stage 2 reflect greater increases. Stage 1 covers a range where either systolic or diastolic has moved past the elevated zone. Stage 2 begins when readings climb higher still. The distinction between stages helps health teams plan their approach. Accurate categorization depends on careful measurement. Blood pressure can vary throughout the day. Single readings may reflect temporary changes rather than sustained patterns. Averaging multiple readings smooths out these variations. The resulting average provides a stable basis for understanding where a person's pressure falls. This method supports clearer conversations between individuals and their health teams.

This article is general health education reviewed by physicians. It is not medical advice for your situation. Talk to your clinician before changing medication or treatment, and seek urgent care for symptoms that worry you.

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