Prevalence of Vitamin D Deficiency and its Association with Thyroid Autoimmunity and Thyroid Hormones in Newly Diagnosed Patients with Autoimmune Thyroid Disease (AITD)

Objective To look for the prevalence of vitamin D deficiency (VDD) and its association with anti-TPO antibody and thyroid hormones (FT3, FT4, and TSH) levels in newly diagnosed patients with autoimmune thyroid disease (AITD). Methods In this case-control study, new-onset AITD hypothyroidism/hyperthyroidism patients (anti-TPO-Ab levels >60 IU/ml) were recruited (n = 50). Fifty age, sex, and BMI-matched euthyroid healthy individuals were taken as controls. Detailed clinical examination and necessary investigations such as serum FT3, FT4, TSH, anti-TPO-Ab, 25 OHD (25 hydroxy vitamin D), and iPTH were measured. Results The prevalence of VDD (25 OHD