• Naru Babaya, Shinsuke Noso, Yoshihisa Hiromine, Yasunori Taketomo, Fumimaru Niwano, Sawa Yoshida, Sara Yasutake, Yumiko Kawabata, and Hiroshi Ikegami.
• Department of Endocrinology, Metabolism and Diabetes, Faculty of Medicine, Kindai University, Osaka-sayama, Osaka, Japan.
• J Diabetes Investig. 2020 Sep 1; 11 (5): 1222-1229.

Aims/IntroductionA flash glucose monitoring (FGM) system has become available. To clarify the relationship between FGM and self-monitoring blood glucose (SMBG) values, we compared the two values after simultaneous measurement in Japanese patients with type 1 diabetes, under daily life settings.Materials And MethodsA total of 20 outpatients with type 1 diabetes were analyzed. When FGM and SMBG were carried out simultaneously (within ±3 min), the values were adopted and each FGM value was matched and compared with the corresponding SMBG value. In addition, we analyzed other cases of simultaneity defined as "within ±2 min," "within ±1 min" and "at the exact same time."ResultsThe percentage of SMBG and FGM values in the clinically acceptable zone A + B in Clarke and consensus error grid analyses were 97.9 and 99.2%, respectively. Deming regression (x-axis: FGM values, y-axis: SMBG values) determined a slope of 0.9128 (95% confidence interval 0.9008-0.9247) and an intercept of +15.94 mg/dL (95% confidence interval 14.05-17.84). FGM values were lower than SMBG values in the lower glucose range, and higher in the higher glucose range. The shorter the time lag between measurements, the higher the rate of concordance between FGM and SMBG values.ConclusionsThe results of this study provided evidence on the reliability of FGM in Japanese patients with type 1 diabetes in home conditions. Based on the results, if an abnormal glucose value is detected by FGM, SBMG should then be used to confirm the result.© 2020 The Authors. Journal of Diabetes Investigation published by Asian Association for the Study of Diabetes (AASD) and John Wiley & Sons Australia, Ltd.

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