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Aims: Hashimoto’s Thyroiditis (HT) is the most common autoimmune thyroiditis worldwide and characterized with lymphomonocytic inflammation of the thyroid gland. Red cell distribution width (RDW) reflects erythrocyte anisocytosis and besides it increases in iron deficiency anemia, recent studies reported that RDW was also associated with conditions characterized with overt or subclinical inflammation. We aimed to answer whether RDW increased in Hashimoto’s thyroiditis.

Methods: Patients with HT admitted to outpatient clinic of our hospital were included to the study. Patients with anemia (especially iron deficiency), diabetes mellitus, chronic inflammatory disease and on medication that may affect hemogram results (e. g., aspirin) excluded from the study. Patient characteristics, thyroid stimulating hormone (TSH), Free T3 (FT3), Free T4 (FT4), Anti-thyroid peroxidase (Anti-TPO), Anti-Thyroglobulin (Anti-TG …