The goal of this retrospective observational study is to determine whether vitamin D levels differ in patients with Hashimoto's thyroiditis (HT) compared to those without Hashimoto's thyroiditis. The main research questions are: Are vitamin D levels lower in HT patients compared to non-HT patients? Do vitamin D levels vary between HT and non-HT patients based on thyroid function status? The study was conducted by retrospectively reviewing the medical records of patients who visited the hospital outpatient clinic.
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Vitamin D 25 OH D
Timeframe: Baseline
thyroid-stimulating hormone (TSH)
Timeframe: Baseline
free thyroxine (fT4)
Timeframe: Baseline
Anti-thyroid peroxidase (anti-TPO)
Timeframe: Baseline
anti-thyroglobulin (anti-TG)
Timeframe: Baseline