MON-372 Treatment-Resistant Vitamin D Deficiency: Is It a Vitamin D Binding Protein Issue?

Introduction Vitamin D is present in free and bound forms; the bound form is complexed mainly to vitamin D binding protein (DBP). Vitamin D levels are affected by age, pregnancy, liver disease, obesity, and DBP mutations. We report a patient with treatment-resistant vitamin D deficiency suggestive of a DBP with abnormal vitamin D binding. Clinical Case A 58-year-old Pakistani male with a history of hypertension, sleep apnea and hypogonadism...