A typical target range for time-in-range (TIR) in CGM is which of the following?

• A. 60-140 mg/dL
• B. 100-180 mg/dL
• C. 70-180 mg/dL
• D. 80-160 mg/dL

Answer: (C)

Time-in-range is the share of time your glucose values from CGM fall within a defined target window. The standard window most guidelines use is 70 to 180 mg/dL. This range is chosen because it minimizes the risk of hypoglycemia (glucose staying above about 70 mg/dL) while also limiting hyperglycemia (staying below about 180 mg/dL), providing a practical balance for daily life. Clinically, staying largely within this band is associated with better overall glucose control and fewer lows, which is why it’s the commonly used target. The other ranges are more restrictive or do not align with how CGM-based TIR is typically defined, so they aren’t the standard reference for time-in-range.