CGMSContinuous glucose monitor system is a small wearable device that measures blood glucose automatically throughout the day and night. It also signifies high and low blood glucose levels so you can take action to keep your blood glucose under control and prevent severe high or low blood glucose levels,CGMS is a device that records blood glucose levels throughout the day and night. It provides up to 288 glucose readings in 24 hours. The system is used to measure average blood glucose for up to 14 days, while the person with Diabetes continues daily activities at work and home. In this method, a tiny, sterile, flexible electrode is inserted just under the skin that measures glucose in the interstitial fluid, a fluid surrounding our cells. A tiny pager-like device shows you the readings every few minutes.The sensor must be calibrated via traditional finger prick glucometer in order to remain accurate. The longer the CGM is worn the more accurate the readings become due to refinement of a copyrighted algorithm specific to the brand of CGM being used. The sensor and transmitter are waterproof, making it more convenient and reliable. Also, some CGMs do not require an extra receiver, but instead send all blood glucose information to the smart phone or smart watch. This eliminates the need to carry around an extra device specifically for blood glucose readings.It is included in the American Diabetes Association, 2023 as standard of care and we try to prescribe CGM for every single person with Type 1 and Type 2 Diabetes on insulin in the USA.History of CGMSCGMS system is one of the biggest advancements in Diabetes management in recent years. Until early 1990s, finger stick glucose monitoring by blood glucose meters was the standard way to measure blood glucose and monitor the glycaemic control in people with Diabetes. However, finger-stick glucose measurements are single-point blood glucose estimations and people have to prick their fingers multiple times a day in order to obtain glucose values at different points of the day. This limitation led to the development of CGMS in the late 1990s. CGMS has become a popular tool to monitor blood glucose and manage Diabetes in most developed countries. .Advantages of CGMSIt provides an accurate picture of fluctuations in blood glucose levels on a continuous real-time basis.It helps people with Diabetes increase awareness about blood glucose fluctuations. Corrective measures taken to prevent these fluctuations may help people with Diabetes delay or avoid associated complications.It reduces risk of night-time hypoglycaemia or hypoglycaemia unawareness by providing an immediate warning. For example, CGM send out an alarm when blood glucose is high or low so insulin or glucose can be taken depending on blood glucosewithout needing to prick their fingers. In addition, CGM indicates whether blood glucose is trending high or low (even before your blood glucose gets high or low) so that the person with Diabetes can become proactive and avoid high or low blood glucose.It can be used by people with Type 1 and 2 Diabetes and also by pregnant women.It is ideal while modifying therapy/adapting to some new diet or exercise plan.The data from the CGMS is useful for your treating physician to make necessary changes to your treatment plan..Current limitations of the CGMSAll current CGMS measure interstitial glucose (fluid between cells). The delay between systemic glucose level and interstitial fluid glucose is estimated to be between 4 to 26 minutes. This delay limits the accuracy of the CGMS, especially when the blood glucose levels are rapidly changing. Most often this results in an overestimation of blood glucose levels. This may cause the person with Diabetes to overdose on insulin, resulting in a rebound low blood glucose level. This is why it is very important for people wanting to use CGMS to receive thorough training from an experienced professional..Future advancesIn U.S., the field is moving pretty fast and from Continuous Glucose Monitor to automated insulin delivery system monitored. Automated delivery system is now a hybrid model and what hybrid means is that the patients still has to announce the meal. The rest is done by the insulin pump and by the CGM and by mathematical connections which is why we call it automated delivery system. But the future is all about making it fully automated so there is no user interference at all. And everything will be done automatically and I see that coming in near future and things are going in right direction.To concludeThere is a need for people with Diabetes to ensure better control over their sugar levels. Research studies have indicated that CGM can help keep a better check on blood glucose fluctuations, lower HbA1c levels and incidences of low blood glucose levels.Real time sugar readings allow a person with Diabetes to take immediate action thereby preventing dangerous high and lows. Patterns of sugar fluctuations can be identified and managed with medication or insulin or dietary changes. This can help people with Diabetes maintain a healthy quality of life.