Abstract
Introduction: Iron deficiency anemia (IDA) has been shown to cause a false increase in glycosylated hemoglobin (HBA1c), but how much increase in hemoglobin (Hgb) causes a certain decrease in HBA1c remains unknown. Knowledge of this ratio will enable more accurate clinical diagnosis and follow-up of diabetes. This study aimed to investigate whether IDA causes a decrease in HBA1c and if it does, how much of a decrease it causes. 
 Material and Method: One hundred and twenty-two patients with IDA made up the study group and sixty-two health volunteers formed the control group. 270 mg ferrous sulphate (=80 mg elemental iron) were administered to the study group each day, orally for 3 months, and a control of age/sex matched healthy participants were monitored. Hgb, serum iron, serum iron binding capacity (SIBC), ferritin and HbA1c levels of all participants were measured and compared at baseline and at the third month of the study.
 Results: There was a significant decrease in HbA1c and SIBC levels at baseline and 3 months in the study group (p
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