Time in Range (TIR)

Time in Range tells you what percentage of your glucose readings fall within a healthy window. For people managing prediabetes, this single number gives you a fuller picture of your glucose health than any one reading can.

How It Works

The app counts every reading you have taken and sorts them into five zones:

• Very Low (TBR-2): Below 54 mg/dL — dangerously low, needs immediate attention
• Low (TBR-1): 54–70 mg/dL — below target, warrants review
• In Range (TIR): 70–140 mg/dL — your healthy target zone for prediabetes
• High (TAR-1): 140–180 mg/dL — elevated, worth investigating the cause
• Very High (TAR-2): Above 180 mg/dL — significantly elevated

The percentage of readings in the 70–140 range is your TIR score. The app displays these five zones as a stacked bar so you can see at a glance where your readings cluster.

Your Target

Goal: TIR above 95% for prediabetes management. This means at least 95 out of every 100 readings should fall between 70 and 140 mg/dL.

A TIR of 70–94% suggests room for improvement. Below 70% indicates that your glucose is spending significant time outside a healthy range and is worth discussing with your doctor.

Why This Matters

A single fasting reading gives you a snapshot; TIR gives you the whole story. Research shows that higher TIR correlates with lower risk of diabetic complications, even before blood sugar reaches diabetic levels. For prediabetics, staying consistently in range is one of the most powerful ways to slow or reverse progression. TIR also captures post-meal spikes and overnight dips that a single morning reading would miss entirely.

What You Can Do

• Take readings consistently — TIR becomes meaningful only when you have readings spread across different times of day (fasting, post-meal, bedtime).
• If your TIR is low, look at the chart: are most out-of-range readings in the high zone (TAR) or the low zone (TBR)? The cause and solution differ completely.
• Common reasons for TAR: large portions of white rice, skipping a walk after meals, poor sleep.
• Common reasons for TBR: skipping meals, very long fasting periods, or overexertion.
• Aim for at least 14 days of data before relying on TIR as a stable indicator.

Based on: International Consensus on Time in Range (Battelino et al., 2019); American Diabetes Association Standards of Care 2023