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Time in range: where does one reading actually fit?

Single readings vary — meals, sleep, stress, sensors. Trends in range are the goal. See where a number sits, then relax about it.

<70
low 70–140
healthy-typical 140–180
upper target >180
above target

Scale shown: 40–250 mg/dL. Bands: 70–140 = where healthy people without diabetes spend ~96% of their time; 70–180 = the international clinical time-in-range target band used in diabetes care (aim: >70% of the day).

Why one number is a snapshot, not a verdict

Glucose moves all day — up after meals, down with movement, drifting with sleep, stress, and hormones. Even people with no blood sugar condition spike above 140 sometimes; sensors and meters carry a real margin of error on top. That's why clinicians increasingly talk about time in range — the share of the day spent between 70 and 180 mg/dL — rather than judging any single reading. One high number after a big lunch is information, not a failure.

The two rulers, kept straight: 70–140 mg/dL describes where healthy people happen to spend most of their time. 70–180 mg/dL is the clinical target band for most adults managing diabetes. They answer different questions — grading yourself against the wrong one creates worry the data doesn't justify. And your personal targets may differ from both: the numbers that matter for you are the ones your care team sets.

What actually moves time in range is the boring, repeatable stuff: a walk after meals (there's a timer for that), fiber with meals, and decent sleep. For the full story on what monitors can and can't tell you, read CGM Basics; to translate a lab HbA1c into these units, use the eAG calculator.

Two situations this page does not cover: pregnancy (including gestational diabetes) uses stricter, individualized targets set by your care team — this general explainer doesn't apply. And a genuinely low reading with symptoms isn't a chart exercise: follow the low-treatment plan you've agreed with your clinician.

Educational tool only — not a diagnostic tool, not medical advice, and not a substitute for the targets your healthcare team has set for you. Nothing you type here is stored or sent anywhere.

Sources

  1. Battelino T, et al. Clinical targets for continuous glucose monitoring data interpretation: recommendations from the international consensus on time in range. Diabetes Care. 2019. pubmed.ncbi.nlm.nih.gov/31177185
  2. Shah VN, et al. Continuous glucose monitoring profiles in healthy nondiabetic participants. J Clin Endocrinol Metab. 2019. pubmed.ncbi.nlm.nih.gov/31127824

What now?

Trends beat snapshots — and habits move trends. Find your biggest everyday pattern in two minutes.

Take the villain quiz → CGM Basics