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CGM – Continuous Glucose Monitoring Explained
CGM (Continuous Glucose Monitoring) is a system for real-time, automatic tracking of blood glucose levels. It is primarily used in the management of diabetes.
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CGM (Continuous Glucose Monitoring) is a system for real-time, automatic tracking of blood glucose levels. It is primarily used in the management of diabetes.
What is CGM?
CGM stands for Continuous Glucose Monitoring and refers to a medical technology that automatically and continuously measures glucose levels in the body – typically in the subcutaneous tissue (the tissue just beneath the skin). Unlike traditional fingerstick blood glucose testing, a CGM system provides a new reading every few minutes, giving a complete picture of glucose levels throughout the day and night.
How Does CGM Work?
A CGM system consists of three main components:
- Sensor: A small, flexible filament is inserted just under the skin, usually on the abdomen or upper arm. It measures glucose in the interstitial fluid (the fluid surrounding the body's cells).
- Transmitter: A small device attached to the sensor that wirelessly sends glucose data to a receiver or compatible device.
- Receiver or Smartphone App: Displays real-time glucose readings, trend arrows, and historical data.
Most modern CGM systems transmit readings every 1 to 5 minutes and can alert users when glucose levels rise above or fall below preset thresholds.
Who Uses CGM?
CGM is most commonly used by:
- People with type 1 diabetes who rely on insulin
- People with type 2 diabetes who use insulin or require intensive glucose management
- Pregnant individuals with gestational diabetes or pre-existing diabetes
- Individuals who experience frequent or hard-to-detect hypoglycemia (low blood sugar)
Benefits of CGM
Continuous glucose monitoring offers several key advantages over conventional blood glucose testing:
- Real-time glucose values without repeated fingersticks
- Trend information showing whether glucose is rising or falling
- Early warnings for dangerous low or high glucose levels
- Better-informed decisions about insulin dosing, diet, and physical activity
- Improved quality of life and greater treatment safety
CGM vs. Flash Glucose Monitoring (FGM)
A closely related technology is Flash Glucose Monitoring (FGM), best known through products such as the FreeStyle Libre. With FGM, the sensor does not transmit data automatically – the user must actively scan the sensor with a reader or smartphone to retrieve a reading. True CGM systems, by contrast, transmit data automatically and continuously and typically include alarm functionality.
Integration with Insulin Pumps
CGM systems can be combined with insulin pumps to create so-called closed-loop systems, sometimes referred to as an "artificial pancreas." In these systems, a software algorithm automatically adjusts insulin delivery based on real-time CGM data. This can dramatically improve blood glucose control and reduce the risk of severe hypoglycemia.
Accuracy and Calibration
CGM sensors do not measure blood glucose directly; they measure glucose in the interstitial fluid. This means there can be a slight time lag (approximately 5–15 minutes) compared to actual blood glucose values. Some older CGM systems required periodic calibration using a fingerstick blood glucose reading, while newer generations are factory-calibrated and work without manual calibration.
Coverage and Availability
In many countries, including the United States and across Europe, CGM devices are covered by health insurance for qualifying patients – particularly those with insulin-dependent diabetes. Coverage criteria vary by country, insurer, and individual clinical situation. A prescription from a healthcare provider is generally required.
References
- American Diabetes Association (ADA): Standards of Medical Care in Diabetes 2024. Diabetes Care, 2024.
- Rodbard D. Continuous Glucose Monitoring: A Review of Successes, Challenges, and Opportunities. Diabetes Technol Ther. 2016;18(Suppl 2):S3–S13.
- National Institute for Health and Care Excellence (NICE): Type 1 diabetes in adults: diagnosis and management. NICE guideline NG17, updated 2022.
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