25-hydroxy vitamin D concentrations negatively correlated with HbA1c in type 2 diabetes mellitus patients: a cross-sectional study in Mampang, South Jakarta

INTRODUCTION: Insulin resistance plays a central role in type 2 diabetes mellitus (T2DM). Another possible cause of T2DM is a deficiency of 25-hydroxy vitamin D [25(OH)D], although the underlying mechanism is not yet clearly understood. The most frequently used laboratory parameters for monitoring T2DM are fasting blood glucose (FBG) and HbA1c. Determining any association of vitamin D with HbA1c and FBG in T2DM. METHODS: A cross-sectional study involving 100 T2DM patients with the following characteristics: 18-year and older persons of both genders, not having kidney and liver disease, not on insulin therapy, not pregnant or lactating, and not consuming vitamin D in the last three months. Spearman’s correlation coefficient was used to test any association of 25(OH)D with HbA1c and fasting blood glucose (FBG) (p