How accurate is DexCom CGM in measuring glucose levels?

The DexCom Continuous Glucose Monitoring (CGM) system is known for its accuracy in measuring glucose levels. DexCom CGM utilizes a tiny sensor inserted under the skin to continuously monitor glucose levels in real-time. Clinical studies have shown that the DexCom CGM has achieved a high level of accuracy when compared to laboratory blood glucose measurements. It provides glucose readings with an average MARD (mean absolute relative difference) of around 9% to 10%. DexCom CGM's accuracy is further improved through regular calibrations with fingerstick blood glucose testing. However, it is crucial to note that CGM readings may slightly differ from actual blood glucose levels due to various factors such as physiological lag and sensor limitations. Nonetheless, DexCom CGM offers reliable and valuable insights into glucose trends for effective diabetes management.