Current NICE guidelines advise routine self-monitoring of blood glucose for all adults with Type 1 diabetes and recommend monitoring at least 4 times per day, including before each meal and before bed.1
Your FreeStyle Libre system monitors interstitial fluid glucose levels continuously.2
Calibration, sometimes called coding, is needed because the sensitivity of each sensor can vary within each batch that is made.
All continuous glucose monitoring systems currently available require calibration.
The FreeSyle Libre sensor is made by a process which means the sensitivity of the sensor varies very little. This means that it is calibrated at the factory - so you do not need to calibrate it again using a finger prick.
The FreeStyle Libre system is clinically proven to be accurate and consistent over 14 days, without the need for finger prick calibration.4
1 NICE (2015). Type 1 diabetes in adults: diagnosis and management (NG17). NICE, London. Available at: www.nice.org.uk/guidance/ng17 (accessed 21.06.2016).
2 A finger prick test using a blood glucose meter is required during times of rapidly changing glucose levels when interstitial fluid glucose levels may not accurately reflect blood glucose levels or if hypoglycaemia or impending hypoglycaemia is reported by the system or when symptoms do not match the system readings. For a complete glycaemic picture, scan the sensor once every 8 hours.
4 Bailey et al. The Performance and Usability of a Factory-Calibrated Flash Glucose Monitoring System. Diabetes Technology & Therapeutics. Nov 2015; 17 (11).
5 LibreLink is a mobile application, developed and provided by AirStrip. Use of LibreLink requires registration with LibreView, a service provided by Abbott and Newyu, Inc. Data charges may apply when downloading the LibreLink app. FreeStyle Libre readers and sensors are provided by Abbott
6 The FreeStyle Libre sensor communicates with the FreeStyle Libre reader that started it or the LibreLink app that started it. A sensor started by the FreeStyle Libre reader will also communicate with the LibreLink app, provided that the LibreLink app is used to scan the sensor within an hour of the sensor starting up.
7 The LibreLink app and the FreeStyle Libre reader have similar but not identical features. A fingerprick test using a blood glucose meter is required during times of rapidly changing glucose levels when interstitial fluid glucose levels may not accurately reflect blood glucose levels or if hypoglycaemia or impending hypoglycaemia is reported by the LibreLink app or when symptoms do not match the LibreLink app readings.
* Basu A, et al., Time Lag of Glucose from Intravascular to Interstitial Compartment in Humans, Diabetes. 2013 Dec; 62(12): 4083–4087. Published online 2013 Nov 16. doi: 10.2337/db13-1132