Iodine Deficiency Clinical Trial
— VIOLETOfficial title:
Variability of Daily Iodine Intake: The Effects of Intra- and Inter-individual Variability on Estimated Intake in Iodine Nutrition Studies
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 |
Verified date | September 2021 |
Source | Swiss Federal Institute of Technology |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Observational |
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.
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 |
Country | Name | City | State |
---|---|---|---|
Switzerland | ETH Zurich | Zürich |
Lead Sponsor | Collaborator |
---|---|
Swiss Federal Institute of Technology |
Switzerland,
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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