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. 2009 Jun;53(4):425-8.
doi: 10.1590/s0004-27302009000400006.

Continuous glucose monitoring system: dawn period calibration does not change accuracy of the method

Gustavo A Augusto  1 , André G P Sousa, Marcela N A Perazo, Maria L C Correa-Giannella, Marcia Nery, Karla F S de Melo
Affiliations

Continuous glucose monitoring system: dawn period calibration does not change accuracy of the method

Gustavo A Augusto et al. Arq Bras Endocrinol Metabol. 2009 Jun.

Abstract

Introduction: Continuous glucose monitoring system is a valuable instrument to measure glycemic control, which uses a retrospective calibration based upon 3 to 4 capillary glucose meter values inserted by the patient each day.

Objective: We evaluated the interference of calibration during the dawn period in the system accuracy.

Methods: The monitoring data were retrospectively divided into two groups: with (Group A) or without (Group B) the dawn period calibration (between 1:00 and 5:00 AM). Accuracy of the method was expressed by relative absolute difference.

Results: Thirty-four continuous glucose monitoring data were evaluated comprising a total of 112 nights. A total of 289 paired readings were analyzed - 195 in Group A and 94 in Group B. We did not find a difference in relative absolute difference (RAD%) in any analyzed period of day by adding dawn calibration.

Conclusions: These data suggest that dawn calibration does not alter accuracy of method.

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