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Seasonal Variations in Serum 25-hydroxy Vitamin-D Levels in a Swedish Cohort

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ClinicalTrials.gov Identifier: NCT02136407
Recruitment Status : Completed
First Posted : May 13, 2014
Last Update Posted : May 13, 2014
Sponsor:
Information provided by (Responsible Party):
Eva Klingberg, Sahlgrenska University Hospital, Sweden

Brief Summary:
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
Vitamin-D Insufficiency

Detailed Description:
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.

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Study Type : Observational
Actual Enrollment : 615 participants
Observational Model: Cohort
Time Perspective: Cross-Sectional
Official Title: Seasonal Variations in Serum 25-hydroxy Vitamin-D Levels in a Swedish Cohort
Study Start Date : October 2009
Actual Primary Completion Date : September 2010
Actual Study Completion Date : September 2010

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Vitamin D
Drug Information available for: Vitamin D

Group/Cohort
Blood donors
N=540
Thrombocyte donors
N=75



Primary Outcome Measures :
  1. 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. ]

Biospecimen Retention:   Samples Without DNA
Serum


Information from the National Library of Medicine

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Ages Eligible for Study:   16 Years to 75 Years   (Child, Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
Blood donors
Criteria

Inclusion Criteria:

  • healthy at the time of donating blood

Exclusion Criteria:

  • unhealthy

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02136407


Locations
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Sweden
Sahlgrenska University Hospital
Gothenburg, Sweden, 41345
Sponsors and Collaborators
Sahlgrenska University Hospital, Sweden
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Responsible Party: Eva Klingberg, MD, PhD, Sahlgrenska University Hospital, Sweden
ClinicalTrials.gov Identifier: NCT02136407    
Other Study ID Numbers: EPN399-09
First Posted: May 13, 2014    Key Record Dates
Last Update Posted: May 13, 2014
Last Verified: May 2014
Keywords provided by Eva Klingberg, Sahlgrenska University Hospital, Sweden:
Vitamin D
vitamin D deficiency
parathyroid hormone