Continuous glucose monitoring (CGM) has evolved from a tool for tracking highs and lows into a high-frequency data stream that provides a complete picture of your metabolic health. By replacing intermittent fingersticks with a continuous view of your glucose trends, these systems reveal how your body uniquely responds to specific meals, exercise, and stress in real time. Dexcom specifically contributes to this ecosystem with features like Urgent Low Soon alerts, which use predictive algorithms to warn you of a drop 20 minutes before it occurs, and a 12-hour grace period on their latest sensors to ensure data continuity during changes. This technology is vital because it shifts the focus from a single A1C number to Time in Range (TIR), providing the high-resolution feedback needed to fine-tune insulin dosing and minimize the long-term rollercoaster effect of glycemic variability.