Related Experiment Video
Updated: Jun 21, 2026
Improving IV Insulin Administration in a Community Hospital
Published on: June 11, 2012
Continuous glucose monitoring system: dawn period calibration does not change accuracy of the method
Gustavo A Augusto1, André G P Sousa, Marcela N A Perazo
1Unidade de Diabetes, Divisão de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil. guakau@yahoo.com.br
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.
Related Concept Videos
01:25Errors occurring during blood pressure monitoring
Several factors...
01:02Glucose Homeostasis: Regulation of Blood Glucose
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...