| Summary: | The aim of this study was to assess vitamin D serum levels in autoimmune thyroid disease, Hashimato thyroiditis in the Turkish population. The subjects with Hashimato thyroiditis (HT, n=67, mean age 45.1±10.9,F/M-61/6), control subjects (mean age 42.1±15.7, n=29, F/M-26/3) were recruited for the study. Thyroid function tests, thyroid antibodies (AntiTg, AntiTPO, TSHRAb), ultrasound features, demographic and antropometric variables were recorded. Vitamin D level was not different between the HT and the control groups (53.1±24.7 nmol/L and 54.1±19.8 nmol/L, as mean, respectively, p = 0.482) In the HT group, 35.8% of subjects had vitamin D insufficiency, only 16.4% of subjects with HT were vitamin D sufficient. There was no significant difference between the HT and the control groups according to the vitamin D classification status (p = 0.666). Vitamin D levels were significantly higher in the subjects who were taking replacement compared to subjects who were not (58.7 ± 26.0 vs. 46.0 ± 23.3, as mean, respectively, p = 0.033). There was no significant correlation between vitamin D levels and TgAb and TPOAb levels in HT group (p = 0.754 r = -0.039, p = 0.134 r = -0.290, respectively). In both HT and control groups, vitamin D levels were significantly correlated only with the fT4 levels (p [Med-Science 2019; 8(1.000): 109-12]
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