Blood Pressure Range

Blood Pressure Range

High blood pressure is also known as hypertension. It is measured in mm Hg (millimetres of mercury).

Blood pressure is always given as two numbers- systolic pressure (when the heart beats) and diastolic pressure (when the heart relaxes). When the measurements are written down, both are written one above or before the other with the systolic being the first number. It is measured using an instrument called the spygnomanometer. It can also be measured digitally.

It is very difficult to correctly define normal blood pressure as the blood pressure range can vary widely. A single blood pressure monitor reading is not reliable. Blood pressure monitor readings must be taken at different times of the day to determine average blood pressure over a period.

High Blood Pressure Range

Systolic (mm Hg)	Diastolic (mm Hg)	Stages of High Blood Pressure
210	120	Stage 4
180	110	Stage 3
160	100	Stage 2
140	90	Stage 1

Normal Blood Pressure Range

Systolic (mm Hg)	Diastolic (mm Hg)	Pressure Range
130	85	High Normal Blood Pressure
120	80	Normal Blood Pressure
110	75	Low Normal Blood Pressure

Low Blood Pressure Range

Systolic (mm Hg)	Diastolic (mm Hg)	Pressure Range
90	60	Borderline Low blood Pressure
60	40	Too Low Blood Pressure
50	33	Dangerously Low Blood Pressure

Note:

• When systolic and diastolic pressure falls into different categories, the higher category should be used to classify the blood pressure level example 160/80 mm Hg would be considered as Stage 2 High Blood Pressure.
• A blood pressure of 130/80 mmHg would be considered as high blood pressure for people with diabetes or chronic kidney disease.

References:

1. Hajjar IM, Grim CE, George V, Kotchen TA. Impact of diet on blood pressure and age-related changes in blood pressure in the US population: analysis of NHANES III. Arch Intern Med. 2001;161(4):589-593
2. Ruidavets J-B, Bongard V, Simon C, Dallongeville J, Ducimetiere P, Arveiler D, Amouyel P, Bingham A, Ferrierres : Independent contribution of dairy products and calcium intake to blood pressure variations at a population level. J Hypertens 2006
3. About cardiovascular diseases - (https://www.who.int/cardiovascular_diseases/about_cvd/en/)
4. Risk of high blood pressure in salt workers working near salt milling plants: A cross-sectional and interventional study - (http://www.ehjournal.net/content/4/1/13)
5. DASH Diet and High Blood Pressure - (http://www.webmd.com/hypertension-high-blood-pressure/guide/dash-diet)
6. Potassium lowers blood pressure - (http://www.health.harvard.edu/fhg/updates/update0705c.shtml)
7. Dietary calcium intake and Renin Angiotensin System polymorphisms alter the blood pressure response to aerobic exercise: a randomized control design - (http://www.nutritionandmetabolism.com/content/4/1/1)
8. Calcium - (http://ods.od.nih.gov/factsheets/calcium.asp)

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