Determinants of Serum Vitamin D Levels in Preadolescent Cystic Fibrosis Children

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Abstract
The effects of liver disease, fat malabsorption and sunlight exposure on serum vitamin D levels were determined in 21 optimally treated preadolescent cystic fibrosis (CF) children over a 12-month period. Manifest liver disease and fat malabsorption appeared not to affect the vitamin D level. However, the level fell significantly in winter, although not below the normal range, suggesting that sunlight exposure is a more important determinant of vitamin D levels in preadolescent CF children than liver disease and fat malabsorption.