However, time spend with high, low, and in-range blood glucose values are markedly different: the first person has a rollercoaster of dangerous highs and lows, the second has moderate variability with fewer highs and lows, and the third person has little variability with all time spent in-range. To illustrate the limitations of A1C and the advantages of Time in Range, see the graphic below that shows three different people – all with the same average blood glucose (154 mg/dl) and the same A1C (7%). A1C is a measure of average blood sugar over a two to three month period it cannot capture time spent in various blood glucose ranges throughout the day. For instance, you can see how specific foods or exercises affect your TIR.īy contrast, A1C cannot reveal these relationships. Thinking about blood glucose in terms of TIR offers a nuanced, cause-and-effect understanding of diabetes. Time in Range captures the highs, lows, and in-range values that characterize daily life with diabetes. For example, 50% Time in Range (70-180 mg/dl) means 12 hours per day spent in-range. Time in Range can also be understood as “hours per day” spent in-range. The example graphics below show various levels of Time in Range, from 0% to 100%:
In a single number, Time in Range captures how your blood glucose levels change throughout the day or over longer periods of time. (Over time, some people decide to aim for a tighter range, such as 70 to 140 mg/dl.)ĭownload our Time in Range Infographic (above) here! The range will vary depending on the person, but general guidelines suggest starting with a range of 70 to 180 mg/dl. “Time in Range” (TIR) is the percentage of time that a person spends with their blood glucose levels in a target range. What exactly is Time in Range, and why does it matter? This is a basic overview of what Time in Range is, why it’s important, the correlation between Time in Range and diabetes complications, recommended Time in Range goals, how to best measure Time in Range, and ways to improve Time in Range, along with links to additional resources.
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