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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT03731312
Other study ID # VIOLET
Secondary ID
Status Completed
Phase
First received
Last updated
Start date October 1, 2018
Est. completion date May 4, 2021

Study information

Verified date September 2021
Source Swiss Federal Institute of Technology
Contact n/a
Is FDA regulated No
Health authority
Study type Observational

Clinical Trial Summary

Iodine status in populations is assessed using urinary iodine concentration (UIC) measured in spot urine samples. The iodine intake is classified as deficient, sufficient, or excessive iodine based on the median UIC (mUIC). However, this approach has limitations, as it does not quantify the prevalence of individuals with habitually deficient or excess iodine intakes. The EAR cut-point method has the potential to quantify prevalence of iodine deficiency and excess. However, little is known about the effects of the inter- and intra-individual variance of UIC. The aim of the study is to quantify the intra-individual variability in dietary iodine intake. The overall goal is to estimate the prevalence of iodine deficiency and excess in the study population and propose sample size recommendations for future iodine nutrition population studies. The results will provide evidence guiding international recommendations for iodine nutrition studies.


Recruitment information / eligibility

Status Completed
Enrollment 206
Est. completion date May 4, 2021
Est. primary completion date May 4, 2021
Accepts healthy volunteers Accepts Healthy Volunteers
Gender Female
Age group 18 Years to 44 Years
Eligibility Inclusion Criteria: - Non-pregnant - Non-lactating - Non-smoking - Residence in Switzerland =12 months - Generally healthy - No family history of goiter - No exposure to iodine containing contrast agents during the last 12 months - Informed consent given Exclusion Criteria: - Participant is not able to understand the study information or procedure, e.g. due to linguistic barriers

Study Design


Related Conditions & MeSH terms


Intervention

Other:
No intervention
This is an observational study and no interventions will be administered.

Locations

Country Name City State
Switzerland ETH Zurich Zürich

Sponsors (1)

Lead Sponsor Collaborator
Swiss Federal Institute of Technology

Country where clinical trial is conducted

Switzerland, 

Outcome

Type Measure Description Time frame Safety issue
Primary Estimated daily urinary iodine excretion Estimated urinary iodine excretion (µg/day) will be obtained from urinary iodine concentration (UIC) and urinary creatinine concentration (UCC) measured in two repeat spot urine samples collected within 7 days 7 days
Secondary Measured daily iodine excretion Measured daily iodine excretion (µg/day) will be obtained from urinary iodine concentration (UIC) and urine volume in a 24 h urine collection 1 day
Secondary Thyroid function test TSH TSH concentration (mU/L) measured in dried blood spots 1 day
Secondary Thyroid function test total T4 Total T4 concentration (nmol/L) measured in dried blood spots 1 day
Secondary Thyroid function test Tg Tg concentration (µg/L) measured in dried blood spots 1 day
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