Is FreeStyle Libre accurate?

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Is FreeStyle Libre accurate?

The FreeStyle Libre system is clinically proven to be accurate, stable and consistent over 14 days compared to blood glucose testing without the need for finger prick calibration

  • In a clinical study, the FreeStyle Libre system achieved 11.4% Mean Absolute Relative Difference (MARD) compared to blood glucose testing2
  • 99.7% of glucose results fall within Zone A and Zone B of the Consensus Error Gridwhen compared against blood glucose testing2
    • The measurement errors associated with these zones have no effect on clinical action and little or no effect on clinical outcomes3


Bailey, T, et al. The Performance and Usability of a Factory-Calibrated Flash Glucose Monitoring System.  Diabetes Technology and Therapeutics v17 n11 July 2015 (10.1089/dia.2014.0378)

Parkes J, Slatin S, Pardo S, et al. A new consensus error grid to evaluate the clinical significance of inaccuracies in the measurement of blood glucose. Diabetes Care. 2000;23(8):1143-1148.