Time in range (TIR) is the percentage of time your glucose stays within a target range, usually 3.9 to 10.0 mmol/L, measured by a CGM. For most adults living with type 1 or type 2 diabetes, the international target is more than 70% of the time.
The 2019 International Consensus on Time in Range also set limits for lows and highs: less than 4% of the time below 3.9 mmol/L (about one hour a day), less than 1% below 3.0 mmol/L (about 15 minutes a day), and less than 25% above 10.0 mmol/L.
Targets are individual. For older adults and people at higher risk of hypoglycaemia, the consensus suggests more than 50% in range with less than 1% below 3.9 mmol/L. In pregnancy with type 1 diabetes, the target range is tighter, 3.5 to 7.8 mmol/L.
Time in range complements HbA1c rather than replacing it, because it shows highs and lows that an average cannot.
Our clinicians can explain how this applies to you and help with the next step, whether that is a referral, a device, funding or a plan the rest of the team can see.
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