8586 A Case Of Vitamin D Toxicity: From Michigan To Hawaii, Vitamin D Is Very High

Abstract Disclosure: A. Abu Limon: None. S.A. Aldasouqi: None. K. Patel: None. F. Akanbi: None. S. Khan: None. P. Kachhadia: None. We report a patient case who is a 46-year-old male, managed for Type 2 diabetes and Vitamin D deficiency (Defined by 25-hydroxy vitamin D levels less than 20ng/ml) at Michigan State University Endocrinology specialty clinic.He started taking 5000 IU daily Vitamin D supplements and on subsequent follow up his levels corrected to 88 ng/ml. His supplements were held.On a routine repeat lab check, his 25-hydroxy vitamin D level is reported to be higher than 200 ng/ml. Which meets the biochemical diagnosis of Vitamin D toxicity. His Calcium level was 9.7 mg/dL (N 8.7-10.3 mg/dL) and PTH-intact level was 38.3 pg/mL (N 14.0-72.0 pg/mL).On questioning the patient, he assured us he is still not on any Vitamin D supplements and that he just got back from a two-weeks long trip from Hawaii and spent hours daily on the beach without using sunblock.He is sure he didn't get tanning, sunburns, or any burns during that period.He was feeling fine without any symptoms or complications.While in Michigan during the winter, with limited number of sunny days, His 25-hydroxy vitamin D levels trended down slowly over the following few months, while Vitamin D supplements kept on hold.The most common cause of Vitamin D toxicity is excessive supplemental Vitamin D use. Other reasons can be related to excessive tanning or burns, that our patient didn't have. Excessive sun exposure or dietary intake is not a known reason to raise Vitamin D levels to a toxic range.Our patient lives in Mid-Michigan, an area known for low number of sunny days (150-180 sunny/ partly sunny days per year ), Which is a reason for high prevalence of vitamin D deficiency in the population. This is Compared to mostly sunny days on the Hawaiian Islands.Coming Back home for the winter season did help his Vitamin D levels to continue trending down back to a safe, non-toxic range. Presentation: 6/2/2024