what do numbers in blood pressure reading mean
- The diastolic blood pressure number or the bottom number indicates the pressure in the arteries when the heart rests between beats. A normal diastolic blood pressure number is 80 or less. A diastolic blood pressure between 80 and 89 is normal but higher than ideal.A diastolic blood pressure number of 90 or higher, on repeated measurements, is considered to be hypertension or high blood pressure.he systolic blood pressure number is always said first, and then the diastolic blood pressure number is given. For example, your blood pressure may be read as â120 over 80â or written 120/80. Blood Pressure Numbers Blood Pressure Home. The two numbers that measure your blood pressure are written like a fraction: one number on top and one on the bottom -- for example, 128/82. The number on top is called the systolic pressure.. Systolic blood pressure measures the pressure inside your blood vessels at the moment your heart beats.lood Pressure Home. The two numbers that measure your blood pressure are written like a fraction: one number on top and one on the bottom -- for example, 128/82. The number on top is called the systolic pressure.. Systolic blood pressure measures the pressure inside your blood vessels at the moment your heart beats.