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So you’re seeing the doctor for an annual checkup and the medical assistant wraps something around your arm. It is connected to a machine that reads your blood pressure.
What do your blood pressure numbers mean?
Your blood pressure is the force exerted by circulating blood throughout the body.
Top number (systolic)
Also known as the systolic number, this value indicates when a single heartbeat is at its maximum pressure (when your heart is pushing blood out of its chamber).
Bottom number (diastolic)
The bottom number is called the diastolic number and indicates when a single heartbeat is at a minimum pressure (when your heart is in between beats).
Measuring blood pressure
The systolic and diastolic numbers are measured in millimeters of mercury (mm HG). (The pressure required to move mercury a specific distance up a glass tube.)
Normal blood pressure
Systolic: below 120
Diastolic: below 80
Borderline high blood pressure
Systolic: 120-139
Diastolic: 80-89
High blood pressure
Systolic: 140 or higher
Diastolic: 90 or higher
The contents of this website are for information purposes only and not intended to be a substitute for professional medical advice, diagnosis, or treatment. Users should not rely on the information provided for medical decision making and should direct all questions regarding medical matters to their physician or other health care provider. Use of this information does not create an express or implied physician-patient relationship.