Objective: One of the most important indicators of platelet reactivity is the mean platelet volume. The platelet distribution width showing the heterogeneity of the platelet volume is a sign of platelet activation. In our study, we aim to show the correlation between ulcerative colitis activity and vitamin D, the platelet distribution width, mean platelet volume. Methods: The Truelove and Witts' severity index was used to determine ulcerative colitis activity. In accordance with the guidelines, serum 25-OH vitamin D levels of >30 ng/ml were considered as sufficient vitamin D, 20-30 ng/ml as vitamin D insufficiency,
Key words: Ulcerative colitis, Vitamin D, Mean platelet volume, Platelet distribution width
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