Time in range (TIR)
The percentage of monitored time within a target glucose band, measured from continuous glucose monitoring with adequate sensor coverage.
CGM time in range estimates the percentage of monitored time inside your target band, commonly 70–180 mg/dL (3.9–10 mmol/L). It captures something an average can hide: two people with the same mean glucose can have very different swings.
A widely cited goal is more than 70% of the day in range, with less than 4% below it. These consensus targets apply to adequately covered CGM records. A sparse manual log shows readings in range, not time in range, and cannot be judged against CGM targets.