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  2. Blood pressure chart: What your reading means - Mayo Clinic

    www.mayoclinic.org/.../blood-pressure/art-20050982

    This blood pressure chart can help you figure out if your blood pressure is at a healthy level. It also can help you understand if you need to take some steps to improve your numbers. Blood pressure is measured in millimeters of mercury (mm Hg). A blood pressure reading has two numbers. Top number, called systolic pressure.