Venous blood samples were collected from all participants on the day they were invited to participate in this study to determine the levels of HbA1c, TSH, FT3, FTcuatro, and antithyroid antibodies and the lipid profile. The hemoglobin A1c (HbA1c) level was measured using the National Glycohemoglobin Standardization Program (NGSP)-standardized and Diabetes Control and Complications Trial (DCCT)-compliant immune turbidimetric assay (Hoffman-La Roche Ltd., Basel, Switzerland), with an inter-measurement coefficient of variation of 1.64% according to the manufacturer's specifications. The reference range was 4.8–6.4% . Lipid profile was assessed using spectrophotometry (enzymatic-colorimetric), and the following reference values were set: total cholesterol 50 mg/dL.
Antithyroid peroxidase (anti-TPO) https://datingmentor.org/cs/menchats-recenze/ and antithyroglobulin (anti-Tg) antibodies were detected in venous blood samples using the electrochemiluminescence immunoassay (ECLIA). The upper normal limit for the anti-TPO antibody was set at 34 UI/mL and for the anti-Tg antibody at 115 U/mL . Values greater than these cut-off values indicated positive results. For the evaluation of thyroid function, TSH, FT4, and FT3 levels were measured using ECLIA.