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Multicenter Study
. 2007 Jan;30(1):59-64.
doi: 10.2337/dc06-1407.

The accuracy of the FreeStyle Navigator continuous glucose monitoring system in children with type 1 diabetes

Darrell M Wilson  1 , Roy W Beck, William V Tamborlane, Mariya J Dontchev, Craig Kollman, Peter Chase, Larry A Fox, Katrina J Ruedy, Eva Tsalikian, Stuart A Weinzimer; DirecNet Study Group
Affiliations
Multicenter Study

The accuracy of the FreeStyle Navigator continuous glucose monitoring system in children with type 1 diabetes

Darrell M Wilson et al. Diabetes Care. 2007 Jan.

Abstract

Objective: To evaluate the accuracy and precision of the FreeStyle Navigator continuous glucose monitoring system in children with type 1 diabetes.

Research design and methods: In 30 children with type 1 diabetes (mean age 11.2 +/- 4.1 years), the Navigator glucose values were compared with reference serum glucose values of blood samples obtained in an inpatient clinical research center and measured in a central laboratory using a hexokinase enzymatic method and in an outpatient setting with a FreeStyle meter. Median absolute difference (AD) and median relative absolute difference (RAD) were computed for sensor-reference and sensor-sensor pairs.

Results: The median AD and RAD were 17 mg/dl and 12%, respectively, for 1,811 inpatient sensor-reference pairs and 20 mg/dl and 14%, respectively, for 8,639 outpatient pairs. The median RAD between two simultaneous Navigator measurements (n = 1,971) was 13%. Ninety-one percent of sensors in the inpatient setting and 81% of sensors in the outpatient setting had a median RAD < or = 20%.

Conclusions: The Navigator's accuracy does not yet approach the accuracy of current-generation home glucose meters, but it is sufficient to believe that the device has the potential to be an important adjunct to treatment of youth with type 1 diabetes.

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Figures

Figure 1
Figure 1
Navigator vs. Laboratory Measured Drops in Glucose (A) and Rates of Change (B) during Exercise
See this image and copyright information in PMC

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