Translating the HbA1c assay into estimated average glucose values in children and adolescents with type 1 diabetes mellitus

Translating the HbA1c assay into estimated average glucose values in children and adolescents with type 1 diabetes mellitus

Authors

  • Ahmed Sayed Department of Pediatrics, Hamad Medical Center, Doha, Qatar
  • Fawzia Alyafei Department of Pediatrics, Hamad Medical Center, Doha, Qatar
  • Vincenzo De Sanctis Quisisana Hospital, Ferrara, Italy
  • Ashraf Soliman Department of Pediatrics, Hamad Medical Center, Doha, Qatar
  • Mona Elgamal Department of Pediatrics, Hamad Medical Center, Doha, Qatar

Keywords:

type 1 diabetes mellitus, children, adolescents, glycated hemoglobin, continuous glucose monitoring system

Abstract

Objective: The A1c assay, expressed as the percent of hemoglobin that is glycated, measures chronic glycemia and is widely used to judge the adequacy of diabetes treatment and adjust therapy. Day-to-day management is guided by self-monitoring of capillary glucose concentrations (milligrams per decilitre or millimoles per litter) as well as by using continuous glucose monitoring systems (CGMS). We found a mathematical relationship between A1c and average glucose (AG) levels measured by CGMS over 5 days and determined the correlation between the variable CGMS parameters and HbA1c in 50 children with type 1 diabetes mellitus (DM-1) on MDI therapy. Research design and methods: A total of 50 diabetic children randomly selected from a cohort of children with DM-1 were included in the analyses. A1c levels obtained at the end of 3 months and measured in a central laboratory were compared with the AG levels during the previous 5 days recorded by CGMS. AG was calculated by combining weighted results from 5 days of continuous glucose monitoring performed before measuring HbA1c, with 3-5 point daily self-monitoring of capillary (fingerstick) glucose. Results: Linear regression analysis between the A1c and AG values provided the tightest correlations HbA1c=0.0494 MG- 2E-14, R2=0.90, P<0.0001), allowing calculation of an estimated average glucose (eAG) for A1c values. Conclusions: Our study showed a linear relationship between HbA1C and AG values measured by CGMS for 5 days before HbA1c measurement. The AG can be easily calculated using a formula derived from linear regression analysis of HbA1c data obtained in our diabetic children.

 

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Published

23-05-2018

How to Cite

1.
Sayed A, Alyafei F, De Sanctis V, Soliman A, Elgamal M. Translating the HbA1c assay into estimated average glucose values in children and adolescents with type 1 diabetes mellitus. Acta Biomed [Internet]. 2018 May 23 [cited 2024 Jul. 24];89(S5):22-6. Available from: https://www.mattioli1885journals.com/index.php/actabiomedica/article/view/7357