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

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.

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Key information

Conditions

Vitamin-D Insufficiency Avitaminosis Deficiency Diseases Malnutrition Nutrition Disorders Nutritional and Metabolic Diseases Vitamin D Deficiency

Age range

16 year–75 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Sahlgrenska University Hospital

Gothenburg, 41345, Sweden

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

healthy at the time of donating blood

Exclusion criteria

unhealthy

Treatment and study plan

Primary outcomes

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.

Sponsors and collaborators

Lead sponsor

Sahlgrenska University Hospital

Other

Registry information

Important dates

Study start: 2009
Primary completion: 2010
Study completion: 2010
First posted: May 13, 2014
Registry last updated: May 13, 2014

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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Completed