Iodine study: should all pregnant women get supplements or only those who need them?
NCT ID NCT03078140
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study looked at two approaches to giving iodine supplements to pregnant women. One group received a daily iodine pill from 14 weeks until delivery. The other group had their urine iodine tested first; only those with low levels got iodine, while others got an iron pill. The goal was to see if the selective approach worked as well as routine supplementation. The study involved 208 women in Thailand.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- iodine supplement (Triferdine) and iron supplement (Ferli-6)
- What this could lead to
- If successful, this could show that checking iodine levels first and supplementing only when needed is as effective as giving iodine to everyone, potentially reducing unnecessary supplementation.
- What could go wrong
- This is a small, completed study focused on urine iodine levels, not on health outcomes for mothers or babies. Results may not apply to other populations or settings.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
-
Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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208 people
The number who actually took part.
- Started
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May 2017
- Finished
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May 2018
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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Children (under 18), adults (18 to 64) and older adults (65 and over)
- Sex
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Female participants only
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * first visit for antenatal care in the first trimester * singleton pregnancy * delivered at Maharaj Nakorn Chiangmai Hospital Exclusion Criteria: * thyroid disease which diagnosed before pregnancy or currently * history of thyroid gland surgery or iodine ablation therapy * received iodine supplement before pregnancy * received any medication for thyroid disease treatment, within 6 weeks postpartum women or breast feeding period * family history of thyroid disease * having underlying disease or contraindication which cannot received iodine supplement * loss follow-up or incomplete data.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Kuntharee Traisrisilp
Chiang Mai, 50200, Thailand
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