What effect does seasonal variability have on HbA1c levels used for diagnosis of type 1 diabetes mellitus (DM)?

Updated: Oct 08, 2021
  • Author: Romesh Khardori, MD, PhD, FACP; Chief Editor: George T Griffing, MD  more...
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One study found seasonal variability in HbA1c levels of school-age children with higher levels (0.44%) coinciding with colder outdoor temperatures, fewer hours of sunlight, and lower levels of solar irradiance. [98] This effect was seen in school-aged children but not preschoolers and may hold importance for studies using HbA1c as a primary endpoint and HbA1c -based diagnosis of diabetes.

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