What Is Flash Glucose Monitoring?
Flash Glucose Monitoring enables you to test your glucose levels without routine pricking your finger1. The small sensor automatically measures and continuously stores glucose readings day and night.
Why Is It Different?
Unlike current blood glucose meters, the FreeStyle Libre sensor measures the glucose in the body's interstitial fluid.
What'S The Difference Between BGM and ISF?
Finger prick blood glucose readings and sensor glucose reading won't always match and in fact are likely to be different2. That's the interstitial fluid (ISF), a thin layer of fluid that surrounds the cells of the tissues below the skin, not from blood. There is a 5 to 10 minute delay in ISF glucose response to changes in blood glucose2. Glucose readings on ISF have been proven to reliably reflect glucose levels3.
Is It Accurate?
The FreeStyle Libre system is accurate, stable and consistent over 14 days3 without the need for fingerprick calibrations.
To assess the accuracy of the FreeStyle Libre sensor, the glucose readings the sensor provides are compared to a known reference. In this case the reference is a finger prick blood glucose reading which is taken at the same time as the sensor scan. The comparison between the 2 different readings is plotted on the Consensus Error grid.
On the Consensus Error Grid, the higher the percentage of readings in Zones A and B, the more accurate the sensor is. The consensus Error Grid below shows 99.7% of sensor results were in Zone A & 99.0% of sensor results were in Zone B of the Consensus Error Grid3.
- 99.7% of sensor results were in Zone A & 99.0% of sensor results were in Zone B of the Consensus Error Grid when compared to capillary blood glucose result3.
- 86.7% of sensor results in Zone A of the Consensus Error Grid3.
- Overall, the FreeStyle Libre system achieved 11.4% Mean Absolute Relative Difference (MARD) compared to blood glucose testing3.
- The FreeStyle Libre system is the only factory calibrated sensor platform powered by Wired Enzyme technology. Wired Enzyme technology provides a stable signal, with minimal sensor drift over time. The advantage of signal stability is that it allows the sensor to be calibrated once in the factory, with no further calibrations required.
Image source: Bailey et al. The Performance and Usability of a Factory-Calibrated Flash Glucose Monitoring System. Diabetes Technology Therapeutics. Nov 2015: 17 (11)