Abstract
Aim: Vitamin D, an immune modulator, may contribute COVID-19 infection. This study aims to assess the relationship between vitamin D value and clinical outcomes (need for mechanical ventilation (MV) support and intensive care unit (ICU) mortality) in critically ill patients diagnosed with COVID-19.
 Material and Method: This study included critically ill adult patients diagnosed with COVID-19 infection. Serum vitamin D level was analyzed using liquid chromatography mass spectrometry. Vitamin D concentration was classified as normal (≥20 ng/mL) and deficiency (0.05).
 Conclusion: Approximately 70% of our study sample has below the normal range of serum vitamin D value. Low serum vitamin D concentrations were associated with increased SOFA, creatinine, and troponin concentrations in patients with COVID-19 infection. Vitamin D deficiency was not a predictor of need for MV support and ICU mortality in COVID-19 patients.
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