“Time in range,” on a continuous glucose monitor (CGM), tells you how much of your day is spent in your ideal blood sugar range. The longer your time in range, the less likely you are to develop certain diabetes complications. Tracking time in range can also help you avoid high or low blood sugar episodes. While a finger stick reads your blood sugar one prick at a time, and an A1C test tracks your average glucose level over two to three months, the CGM gives you real-time updates for as long as you wear it (usually two weeks at a time). While both the finger stick test and A1C tests are useful, time in range is the most precise blood sugar tracking method you can use.