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# Normal Blood Pressure Guide

Updated July 19, 2017

Blood pressure is the force of blood against the arterial vessels during contraction of the heart. Blood pressure varies throughout the day, depending on activities. Blood pressure also varies between infants, children and adults. It is important to know normal blood pressure values in order to prevent complications and to live healthier lives.

## Preemies and Extreme Preemies

Normal blood pressure for premature babies is based on gestational age and weight. The mean arterial pressure (map) which is MAP = [(2 x diastolic) + systolic] divided by 3, should not be less than the child's gestational age. For example [(2 x 28) + 49)]/3=35. So, a 35-week preemie should have a blood pressure of about 49/28 (35) as a neonate. This is not written in stone. Other conditions affecting preemies and extreme preemies, who are usually sick and hospitalized at birth, should be considered. The best way to evaluate blood pressure is to evaluate heart rate, pulses, color, urine output, activity and temperature rather than looking at the blood pressure alone.

## Children Less Than 1 Year

Normal blood pressure in children less than 1 year is usually 70/30 or greater. It can be higher or lower, depending on activity and circumstances.

When calculating a child's (greater than 1 year) normal blood pressure consider this formula: 90 + 2(age in years) is normal; 70 + 2(age in years) is the lower end. For example: A 7-year-old child's systolic (top number) pressure would be between 70 + 2(7) =84 and 90 + 2(7) =104. The bottom number (diastolic) should be 30-45 less than the systolic number. So the healthy 7-year-old child's pressure should be from 84/39 to 104/59.