Accurate or Not? At-Home Cholesterol Tests and Blood Pressure Monitors
The advantages and disadvantages of checking your cholesterol and blood pressure at home.
Home Cholesterol Tests continued...
Third, and perhaps most important, blood cholesterol -- unlike blood
pressure -- doesn't change on a day-to-day or even week-to-week basis. Doctors
recommend that healthy adults get cholesterol tests every five years; people
with higher cholesterol levels or risk factors for cardiovascular disease may
need to be tested more often. But even then, testing at home isn't really
Bottom line: At-home cholesterol tests may satisfy your curiosity, but
they don't provide enough information to be truly helpful.
Home Blood Pressure Monitors
Home blood pressure monitors are a different story. They allow you to
measure your blood pressure on a daily or even hourly basis, so you can gauge
the effect of medication, activities, time of day, or even emotions on your
blood pressure. They can be crucial if you tend toward high blood
pressure, or if you have normal blood pressure, but get high readings at the
doctor's office, a condition called "white coat hypertension."
Like blood pressure monitors in a doctor's office, the at-home monitors
measure the force of blood inside an artery in your arm. During the test, a
cuff that is wrapped around your arm inflates, temporarily stopping the flow of
blood in your arm. When the cuff is released, you (or the nurse or the device)
will listen for the sound of blood flowing back into the artery.
You can choose from three different types of blood pressure monitors.
Manual Blood Pressure Monitors
Technically called "sphygmomanometers," manual blood pressure
monitors consist of an arm cuff, a squeeze bulb, a gauge (or digital display),
and a stethoscope or microphone. To use them, you strap the cuff onto your arm,
squeeze the bulb, and listen for the sound of your pulse starting and then
fading away again.
Manual blood pressure monitors cost between $20 and $30
and can be difficult to use, especially if you're not
used to using a stethoscope, if you have impaired vision or hearing, or if you
have trouble with manual dexterity.
Automatic (or Digital) Blood Pressure Monitors
Powered by batteries, automatic blood pressure monitors have a cuff that is
attached to your wrist or upper arm. An electronic monitor inflates and
deflates the cuff, making this kind of device far easier to use than the manual
ones. The monitor then displays your blood pressure. These blood pressure
monitors generally cost between $40 and $100. Although they're easier to use,
they're also sensitive and the readings can be influenced by your body
position. Health professionals generally recommend having these devices
adjusted at least once a year to make sure they're still accurate.
Despite the problems with both kinds of blood pressure monitors, many
doctors encourage their patients to use them, so that they can be aware of
dangerous spikes in their blood pressure and take a more active role in their
home care. But if you do decide to monitor your own blood pressure,
- To avoid fraud, buy monitors only from reputable pharmacies or medical
supply stores and be sure they are FDA approved.
- Follow the manufacturer's directions to make sure you're getting the most
- Share the results with your doctor, so that he or she can advise you on the