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Diabetes Health Center

Diabetes and Continuous Glucose Monitoring

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Continuous glucose monitoring (CGM) is an FDA-approved system that tracks your blood sugar levels day and night. The device collects readings automatically every 5 minutes. Along with your finger sticks, this device can help detect trends and patterns and give you and your doctor a more complete picture of your diabetes. The data can help you find ways to better manage the condition. There are several devices available for adults and children. 

How Does It Work?

CGM uses a tiny sensor that is typically put under the skin on your belly. You can put it in quickly and it’s usually not painful. It measures the amount of sugar, called glucose, in the fluid inside your body. A transmitter on the sensor then sends the information to a wireless pager-like monitor that you can clip on your belt. The monitor displays your sugar levels at 1-, 5- and 10-minute intervals. If your sugar drops to a dangerously low level or a high preset level, the monitor will sound an alarm.

In the past, only doctors could see the readings CGM systems collected. Now anyone can use the devices as part of at-home diabetes care. You can download data on your computer, tablet, or smartphone to see patterns and trends in your glucose levels. The information can help you and your doctor make the best plan for managing your diabetes, including:

  • How much insulin you should take
  • An exercise plan that’s right for you
  • The  number of meals and snacks you need each day
  • The correct types and doses of medications

CGM doesn’t replace home monitors or need for finger sticks. You’ll still need to measure your blood sugar with a regular glucose meter a few times a day to help the monitor stay accurate. You should also replace the sensor under your skin every 3 to 7 days. 

If you use an insulin pump, you can also link it to your CGM system for continuous care. You won’t need to manually program the pump as with the other finger-prick methods. This is called a “sensor-augmented pump.”

The FDA has approved CGM systems made by Abbott, DexCom, and Medtronic. You need a prescription from your doctor to get one.

Is This Normal? Get the Facts Fast!

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If the level is below 70 or you are experiencing symptoms such as shaking, sweating or difficulty thinking, you will need to raise the number immediately. A quick solution is to eat a few pieces of hard candy or 1 tablespoon of sugar or honey. Recheck your numbers again in 15 minutes to see if the number has gone up. If not, repeat the steps above or call your doctor.

People who experience hypoglycemia several times in a week should call their health care provider. It's important to monitor your levels each day so you can make sure your numbers are within the range. If you are pregnant always consult with your health care provider.

Congratulations on taking steps to manage your health.

However, it's important to continue to track your numbers so that you can make lifestyle changes if needed. If you are pregnant always consult with your physician.

Your level is high if this reading was taken before eating. Aim for 70-130 before meals and less than 180 two hours after meals.

Even if your number is high, it's not too late for you to take control of your health and lower your blood sugar.

One of the first steps is to monitor your levels each day. If you are pregnant always consult with your physician.

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