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

Gustavo A. Augusto, André G. P. Sousa, Marcela N. A. Perazo, Maria L. C. Correa-Giannella, Marcia Nery, Karla F. S. de Melo
2009 Arquivos brasileiros de endocrinologia e metabologia  
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).
more » ... 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.
doi:10.1590/s0004-27302009000400006 pmid:19649379 fatcat:u6vwkzok3zatlnrrd7tro2hxui