Seasonal Variations in Serum 25-hydroxy Vitamin-D Levels in a Swedish Cohort
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ClinicalTrials.gov Identifier: NCT02136407
Recruitment Status :
First Posted : May 13, 2014
Last Update Posted : May 13, 2014
Sahlgrenska University Hospital, Sweden
Information provided by (Responsible Party):
Eva Klingberg, Sahlgrenska University Hospital, Sweden
The purpose of this study was to study seasonal inter-individual and intra-individual variations in S-25(OH)D and to explore parameters associated with S-25-OHD in healthy Swedish adults.
Condition or disease
Serum was collected during 12 months and analysed for 25(OH)D in 540 healthy blood donors. The blood donors answered questionnaires concerning vitamin D supplements, smoking, physical activity, sunbed use and holidays in sunny locations. Repeated serum samples were also collected from thrombocyte donors to study the intra-individual variations in S-25(OH)D.
Inter-individual and intra-individual varations in serum 25-hydroxy vitamin-D during different seasons. [ Time Frame: Group1:Blood donors, single test, 25(OH)vit D at inclusion . Group 2: thrombocyte donors: multiple tests, serum 25(OH)vit D during 8 months. ]
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