Comparison of different biochemical parameters between the healthy control group (Control) and Hashimoto thyroiditis (HT) group. (A) Serum concentration of free T4 (FT4) and serum thyroid-stimulating hormone (TSH); (B) Serum concentration of 25(OH)D and ferritin; (C) serum anti-TPO (thyroperoxidase) and anti-Tg (thyroglobulin); (D) hematocrit (Hct) and Mean Corpuscular Volume (MCV) were tested in HT cases and in healthy controls. The x-axis represents the concentration of each biochemical parameter. The units for each biochemical parameter are displayed in the y-axis.