Before we look at how to use a home blood pressure digital monitor, and which ones are the best, let’s first consider what the blood pressure readings will mean. These figures are taken from the National Heart, Lung and Blood Institute.

Digital Home Blood Pressure Monitors v Doctor’s sphygmomanometer

When you get your blood pressure measured at the doctor’s office, he/she will place a cuff around your upper arm, level with your heart.

The cuff is inflated, and then, while the doctor listens on his/her stethoscope placed on your arm just below the cuff, the cuff is slowly deflated. the doctor is listening out for the first signs of a "tapping sound" which signals the point when the cuffs pressure is just less than the pressure of your blood, and blood flows intermittently past the cuff during heart beat. At this point, the doctor notes the pressure on the sphygmomanometer. This is your systolic blood pressure.

The cuff continues to be deflated until the "tapping" sound completely disappears. This is the point where full blood flow has been restored, and represents your diastolic blood pressure.

Measurements taken by your doctor are the most accurate, and most reliable. However, due to a phenomenon called "White Coat Syndrome", some patients find their blood pressure raised by the mere act of visiting the doctor. I suffer from this, and find that my blood pressure is significantly lower (even normal) at home, yet at the doctor’s office, it is always high. Because of White Coat Syndrome, more and more doctors are recommending digital home blood pressure monitors for their patients.

If decide to buy a home monitor, you MUST get it checked at your doctor’s office for accuracy. These meters can be extremely accurate, but you need to check that yours is calibrated properly. All you need to do is to go and get the doctor to check your blood pressure, wait 2 minutes, and then take your blood pressure using your digital meter. The two readings should be very similar (they wont be 100% the same as blood pressure varies). Once accuracy is confirmed, you can confidently take your blood pressure at home.

Types of personal blood pressure monitors

I have seen and used two types of home monitors. One has a cuff that goes around your wrist, while the other has a cuff that goes around your upper arm (at the level of your heart). While I have not done extensive testing, I did find the wrist cuff more temperamental and inaccurate. My own recommendation is that you buy a blood pressure monitor with the arm cuff. They are both similarly priced and can be bought for between $50 – $100.

Precautions when taking your own blood pressure

It is important that your are completely relaxed when you measure your blood pressure. There are also a few other guidelines that you should stick to before taking your reading:

1. Empty your bladder before sitting down to take a reading.
2. Don’t drink coffee for at least an hour before measuring your blood pressure.
3. Don’t smoke for at least 1 hour before.
4. Sit for five minutes with your back supported and your feet flat on the ground before taking your blood pressure. Keep your arm supported on a table at heart height.
5. Do not wear tight fitting clothes on your arm. When you fit the cuff, your rolled up sleeve should not be constricting your arm at all. If in doubt, take off your top.
6. Take two readings two minutes apart, and find the average.

Where to Buy Blood Pressure monitors

With these personal monitors being relatively cheap and yet highly accurate, we recommend you buy one to use at home. This will prevent "White Coat Syndrome" where your blood pressure is elevated just because you visit the doctors. However, when you get your, you must visit your doctor to check its accuracy. 

Our recommended supplier of blood pressure monitors usually have a range of wrist and upper arm cuff monitor.  See our guidelines to choosing a blood pressure monitor, and see what is available online:

Choosing a blood pressure monitor

To prepare for each set of readings, I sat down for 5 minutes before taking the first reading.

The coffee used in this experiment was strong filtered coffee. After taking a few baseline readings, I drank the coffee in one go. The amount was equivalent to 4 small expresso coffees. I then continued to take my blood pressure every few minutes. I then sat as still as possible, taking my blood pressure every three minutes.

Here are my results:

Here is the data as a graph showing the effect of caffeine coffee on blood pressure:

You’ll see that there is an almost immediate increase in systolic pressure, followed by a drop. This then increases again about 10 minutes after drinking the coffee to a maximum measured blood pressure of 138/89 about 23 minutes after the coffee was drunk. The blood pressure then starts dropping again, until normal blood pressure is restored at around 30 minutes after drinking the coffee.

What we see happening is a temporary increase in blood pressure in response to the coffee, which the body then corrects. How caffeine raises blood pressure seems to be unclear, but what is certain in my case is that it did raise my blood pressure, but only for a short period of time.

For those with high blood pressure, it would appear that coffee could be a problem due to the high spike after drinking the coffee. However, since my blood pressure is normal, I wont be switching to decaf.

My next experiment is to see what effect drinking filtered decaffeinated coffee has. Is it the caffeine in the coffee that raised my blood pressure, or something else?  You can see the results of my experiment on the does decaffeinated coffee affect blood pressure page.  The results may surprise you!

It is vitally important that you keep checks on your blood pressure, and if high, seek medical help. While blood pressure medications can help reduce a dangerously high blood pressure, they often do have side-effects. In my own case, I wanted to find ways to help control my blood pressure naturally, and within a couple of months, my blood pressure was largely under control. The following tips are for information only. Please consult your doctor if you have high blood pressure.

Tips for controlling blood pressure

• Reduce alcohol intake if you drink more than three alcoholic beverages a day. Small amounts of alcohol don’t seem to affect blood pressure in the same way, but heavy drinkers will benefit from reducing alcohol intake.
• Drink plenty of fresh water – your body is made up of a high percentage of water. If you don’t drink enough, your body tries to hold onto it, causing bloating. By drinking water regularly throughout the day, your body can detoxify your body. Your urine can be a good gauge to whether you are drinking enough water. The darker it is, the more dehydrated you are.
• Increase levels of activity – this will exercise your heart. Studies regularly show that increased exercise will help lower blood pressure.
• Lose weight if you need to – if you are over-weight, your heart has to work harder to pump blood around your body. Losing weight can reduce blood pressure, and you’ll feel a lot better as well.
• Reduce salt intake – your body does require salt, but in most cases, it can be supplied in sufficient doses by eating a balanced diet. Foods contain salt, so you don’t need to add extra. Since sodium (a component of salt) is involved in regulating body fluids, it can play a role in high blood pressure. If you eat canned products, read the labels. Look for food sources low in sodium.
• Avoid food high in fat or cholesterol.
• Stop smoking – nicotine has been shown to constrict blood vessels (making them narrower), raising the pressure in the vessels.
• Reduce Caffeine intake – My morning coffees are an important part of my daily routine, but I found that by having one caffeine coffee, and then switching to decaffeine coffee for the rest of the morning, I could have the best of both worlds, while helping to reduce my blood pressure.

Prior to following these tips, my blood pressure regularly reached 140/90 and even 140/100. After two months of following these tips, my blood pressure was normal, and often as far down as 115/68. These tips were responsible for controlling my high blood pressure, and meant that I could avoid going onto drugs. If you decide to try the natural route, please do consult your doctor first. The above information does not constitute medical advise.