• Holger Schäffler, Martin Schmidt, Astrid Huth, Johannes Reiner, Änne Glass, and Georg Lamprecht.
• Division of Gastroenterology, Department of Medicine II, University of Rostock, Rostock, Germany.
• J Dig Dis. 2018 Jan 1; 19 (1): 24-32.

ObjectiveThere is growing evidence that vitamin D deficiency plays a role in the development and the course of inflammatory bowel disease (IBD). However, the correlation between vitamin D deficiency and clinical parameters in IBD is still not completely understood.MethodsA retrospective study of IBD patients was performed. Vitamin D values were analyzed, regardless of vitamin D substitution administration, and correlated with clinical parameters such as medical therapy, anatomical situation, location of the disease and disease activity. Level of 25-hydroxyvitamin D [25(OH)D] <50 nmoL/L was regarded as vitamin D deficiency and <75 nmoL/L as insufficiency.ResultsIn total, 208 IBD patients were analyzed, including 123 with Crohn's disease (CD) and 85 with ulcerative colitis (UC). Therapy with azathioprine did not affect the vitamin D values of either disease entity. But CD patients benefited from therapy with tumor necrosis factor-α inhibitor and exhibited significantly higher vitamin D levels than those without. Furthermore, significantly lower vitamin D levels were found if CD was located in the small bowel or if the small bowel had been resected. Moreover, significantly lower levels of vitamin D were detectable for high disease activity (reflected by high simple clinical colitis activity index values) in patients with UC.ConclusionsVitamin D deficiency is common in patients with IBD. However, certain clinical situations lead to significantly lower vitamin D levels and may therefore require close monitoring for vitamin D deficiency.© 2017 Chinese Medical Association Shanghai Branch, Chinese Society of Gastroenterology, Renji Hospital Affiliated to Shanghai Jiaotong University School of Medicine and John Wiley & Sons Australia, Ltd.

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