Swiss National Iodine Survey 2015

Swiss National Iodine Survey 2015; A Cross-sectional Study to Assess Iodine Status in School Children, Women of Reproductive Age and Pregnant Women

The aim of this study is to monitor iodine nutrition in Switzerland in order to inform the authorities regarding iodine content in iodized salt. As a proxy for the entire population the investigators will study school aged children, pregnant women and women of reproduction age.

In a national sample of school aged children (n=990), pregnant women (n=700) and women of reproductive age (n=700) urinary iodine will be determined in order to assess iodine nutrition in Switzerland. In addition, in both groups of women a blood sample will be taken for the determination of thyroid hormones, iron- and folate status. Questionnaires will be used for the determination of dietary iodine and salt intake as well as sociodemographic parameters.

Inclusion Criteria:

• Healthy
• Living in Switzerland for at least 1 year
• For pregnant women: singleton pregnancy

Exclusion Criteria:

• Major known medical illness: thyroid dysfunction, gastrointestinal or metabolic disorders and taking chronic medications
• For women of reproductive age: pregnancy, breastfeeding
• Use of X-ray or CT contrast agent or iodine containing medication within the past year