Home Blood Pressure Test
A home blood pressure test allows you to keep track of your blood pressure at home. Blood pressure is a measure of the force of blood inside an artery.
Most people use an automatic device to measure blood pressure at home. This device works by inflating a cuff around the upper arm to temporarily stop the flow of blood in an artery. As air is slowly released from the cuff, the device records the pressure at which blood begins to flow again.
Blood pressure is recorded as two measurements.
- The first number is the systolic pressure. Systolic pressure represents the peak blood pressure that occurs when the heart contracts.
- The second number is the diastolic pressure. Diastolic pressure represents the lowest blood pressure that occurs when the heart relaxes between beats.
These two pressures are expressed in millimeters of mercury (mm Hg) because the original devices that measured blood pressure used a column of mercury. Blood pressure measurements are recorded as systolic/diastolic (say "systolic over diastolic"). For example, if your systolic pressure is 120 mm Hg and your diastolic pressure is 80 mm Hg, your blood pressure is recorded as 120/80 (say "120 over 80").
Automatic blood pressure monitors
Automatic monitors, also called electronic or digital monitors, are battery-operated monitors that use a microphone to detect blood pulsing in the artery. The cuff, which is wrapped around your upper arm, automatically inflates and deflates when you press the start button.
The type of blood pressure monitor typically found in supermarkets, pharmacies, and shopping malls is an automatic device.
Blood pressure monitors that measure your blood pressure in your finger or your wrist are not usually accurate and are not recommended.
Manual blood pressure monitors
Manual models are similar to those that your doctor might use to take your blood pressure. Called a sphygmomanometer, these devices usually include an arm cuff, a squeeze bulb to inflate the cuff, a stethoscope or microphone, and a gauge to measure the blood pressure.
A blood pressure measurement is taken by temporarily stopping the flow of blood in an artery (usually by inflating a cuff around the upper arm) and placing the stethoscope on the skin over the artery. You listen for the sound of the blood beginning to flow through the artery again as air is released from the cuff.