Time in Range

An important metric that goes beyond HbA1c

Time in Range is a metric that complements HbA1c and provides actionable information for you and your patients. It helps you quickly assess patients’ glucose, contextualise their HbA1c and increase their Time in Range.

What is Time in Range?

Time in Range is the percentage of time per day a person spends within target glucose range. The FreeStyle Libre system automatically calculates the percentage of time your patient spends in, above, or below target range.

The International Consensus sets clear targets for Time in Range1.

Recommended Time in Range for most T1D, T2D, non-pregnant, not older, or at risk adults regardless of insulin therapy:

Time in Range Time in Range

Why is Time in Range Important?

  • Every 10% increase in Time in Range can lower HbA1c by 0.8% in type 1 and type 2 patients2

  • Every 5% (~1 hour per day) increase in Time In Range has positive impact on your patients’ glucose control1,2

  • Spending more Time in Range can reduce long-term health complications3

  • Easily visualise Time in Range and set clear targets for your patients with the FreeStyle Libre Portfolio

Clinically significant results Clinically significant results Clinically significant results

Improved %TIR is associated with reduced risk of long term complications of diabetes

Increased %TIR is correlated with reduced risk of diabetes related heart4, kidney3 and eye3 disease, as well as better peripheral nerve function.6

reduced risk reduced risk

HbA1c has limitations

HbA1c reflects average glucose over the last 2–3 months; it does not show glycaemic excursions of hyper- and hypoglycaemia.7

An increase in Time in Range results in a decrease in HbA1c.

Estimate of HbA1c for a given Time in Range level based on T1D and T2D studies2:

Time in Range HbA1c chart Time in Range HbA1c chart

Time in Range & The FreeStyle Libre System

When your patient scans their sensor, the FreeStyle LibreLink app will automatically calculate the percentage of time they spend in, above, or below target range. This will help identify where your patient needs more support in managing their overall diabetes health.

This Time in Target report shows a person who spent 75% of their day in target glucose range:

what is TIR what is TIR

The FreeStyle Libre system can help increase %TIR

Real world data show FreeStyle Libre system users increased Time in Range with more frequent scan rate.5

  • Real world data comparing two groups from lowest to highest scan rate (3.5 and 38.5 scans/day)
  • 592,328 patients using the FreeStyle Libre system who scanned more often saw an increase in %TIR

Time in Range & LibreView

Easily visualise Time in Range for your patients with LibreView

Time in Range chart Time in Range chart

LibreView is a secure, cloud-based diabetes management system. It provides both healthcare professionals and patients with access to a consistent set of clear, intuitive reports8 that make it easy and fast to discover patterns and trends.

With the AGP report on LibreView you can:

  • See Time in Target guidelines and an overview of patient glucose data
  • Quickly assess your patient’s Time in Range
  • Identify trends and patterns at a glance
  • Identify specific times of deviation with the Daily Glucose Profiles

Additional Resources

Educational Modules

Learn more about Time in Range and the FreeStyle Libre Portfolio through our Healthcare Professional education modules.


We offer various on-demand webinars for Healthcare Professionals including Understanding Time in Range.




CME Modules

Take part in our three-part CME accredited webcast programme exploring the growing role of Time In Range as a critical metric of glycemic control in diabetes management.



Training Resources

Explore our training resources to help you to help your patients understand Time in Range better.


References & Disclaimers

Images are for illustrative purposes only. Not real patient or data.

1. Battelino T, Danne T, Bergenstal RM, et al. Clinical targets for continuous glucose monitoring data interpretation: recommendations from the international consensus on time in range. Diabetes Care. (2019);42(8):1593-1603  

2. Vigersky RA, McMahon C. The relationship of hemoglobin A1c to time-in-range in patients with diabetes. Diabetes Technol Ther. (2019);21(2):81-85    

3. Beck RW et al. Diabetes Care 2019;42:400–405.

4. Lu J, et al. Diabetes Technol Ther. 2020 Feb;22:72-78.

5. Lang J, Jangam S, Dunn T, Hayter G. Expanded real-world use confirms strong association between frequency of flash glucose monitoring and glucose control [Poster 972]. Diabetes 2019 Jun; 68(Supplement 1)

6. Li F, et al. Diabetes Res Clin Pract. 2020 Aug;166:108289. doi: 10.1016/j.diabres.2020.108289

7. Hirsch, I. Clinical Diabetes (2019): https://doi.org/10.2337/cd18-0054.

8. Unger, Jeff, Pamela Kushner, and John E. Anderson. "Practical guidance for using the FreeStyle Libre flash continuous glucose monitoring in primary care." Postgraduate Medicine (2020): 1-9. https://doi.org/10.1080/00325481.2020.1744393.

₼ The LibreView website is only compatible with certain operating systems and browsers. Please check www.LibreView.com for additional information.

◊ The FreeStyle LibreLink app and the FreeStyle Libre reader have similar but not identical features. Finger pricks are required if readings do not match symptoms or expectations. The FreeStyle Libre sensor communicates with the FreeStyle Libre reader that started it or the FreeStyle LibreLink app that started it. A sensor started by the FreeStyle Libre reader will also communicate with the FreeStyle LibreLink app. The FreeStyle LibreLink app is only compatible with certain mobile devices and operating systems. Please check the website for more information about device compatibility before using the app. Use of FreeStyle LibreLink requires registration with LibreView.