Relation of fasting and postprandial and plasma glucose with hemoglobinA1c in diabetics

CONTEXT: Control of plasma glucose could prevent the progression of most of the complications of diabetes and hemoglobinA1c (HbA1c) is the most important criterion controlling these long-term complications. AIMS: This study was performed to assess the effect of fasting plasma glucose (FPG) and two- hour postprandial plasma glucose (2hpp) levels on HbA1c. MATERIALS AND METHODS: In this descriptive, cross-sectional study; 300 patients were enrolled, assessed, and followed up at the clinic of the Diabetic Center of the University of Medical Science, Hamadan, Iran. All studied patients were diagnosed type 1 or 2 diabetes mellitus. Sampling was performed; we assessed FPG and 2hpp plasma glucose at baseline and at every two weeks to one month-as needed. HbA1c was assessed at the end of study. Results were analyzed by Pierson Covariance and Multiple Regression methods. RESULTS: The mean plasma glucose in three groups of HbA1c (good to fair) were 148.5 ± 56.80 mg/dl at fasting, and 199.70 ± 53.01 mg/dl at two hours after breakfast (2hpp) and mean concentration of HbA1c were 8.41 ± 1.1 %. The plasma glucose level and HbA1c were 0.312 for fasting and, 0.416 for 2hpp at covariant value. CONCLUSION: The postprandial (after breakfast) plasma glucose has closer association to glycosylated hemoglobin than fasting plasma glucose, therefore evaluating postprandial plasma glucose should be our focus.