Iodine and thyroid status during pregnancy and risk of stillbirth

A population‐based nested case–control study

Bibliographic Data

ID15536303
AuthorsAlexandra Purdue-Smithe (0000-0002-7356-3651, Eunice Kennedy Shriver National Institute of Child Health and Human Development), Tuija Männistö (0000-0002-6382-9153, Oulu University Hospital), Elijah Reische (Eunice Kennedy Shriver National Institute of Child Health and Human Development), Kurunthachalam Kannan (0000-0002-1926-7456, New York University), Un‐Jung Kim (The University of Texas at Arlington), Eila Suvanto (Oulu University Hospital), Heljä‐Marja Surcel (Oulu University Hospital), Mika Gissler (0000-0001-8254-7525, Karolinska Institutet), James L Mills (0000-0003-4496-332X, Eunice Kennedy Shriver National Institute of Child Health and Human Development, corresponding author)
Year2021
Volume18
Issue1
Pagese13252-e13252
Publication date2021-08-04
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueMaternal and Child Nutrition (JOURNAL)
Journal identifiersISSN: 1740-8695 • E-ISSN: 1740-8709
PublisherWiley (PUBLISHER • GB)
DOI10.1111/mcn.13252
PMID34350728
OpenAlexW3187974503
LanguageEN
References cited32

Prior research suggests that severe iodine deficiency in pregnancy may be associated with stillbirth. However, the relationship between mild to moderate iodine insufficiency, which is prevalent even in developed countries, and risk of stillbirth is unclear. We thus examined associations of iodine status and risk of stillbirth in a prospective population-based nested case-control study in Finland, a mild to moderately iodine insufficient population. Stillbirth cases (n = 199) and unaffected controls (n = 249) were randomly selected from among all singleton births in Finland from 2012 to 2013. Serum samples were collected between 10 and 14 weeks gestation and analysed for iodide, thyroglobulin (Tg) and thyroid-stimulating hormone (TSH). Odds ratios (ORs) and 95% confidence intervals (CIs) for stillbirth were estimated using logistic regression. After adjusting for maternal age, prepregnancy body mass index, socio-economic status and other factors, neither high nor low serum iodide was associated with risk of stillbirth (Q1 vs. Q2-Q3 OR = 0.92, 95% CI = 0.78-1.09; Q4 vs. Q2-Q3 OR = 0.78; 95% CI = 0.45-1.33). Tg and TSH were also not associated with risk of stillbirth in adjusted models. Maternal iodine status was not associated with stillbirth risk in this mildly to moderately iodine-deficient population. Tg and TSH, which reflect functional iodine status, were also not associated with stillbirth risk. The lack of associations observed between serum iodide, TSH and Tg and risk of stillbirth is reassuring, given that iodine deficiency in pregnancy is prevalent in developed countries

Biology · Case-control study · Confidence interval · Environmental health · Gestation · Gynecology · Iodine · Iodine deficiency · Nested case-control study · Obstetrics · Odds ratio · Population · Pregnancy · Thyroglobulin · Thyroid · Chemistry · Maternal and fetal healthcare · Medicine · Pregnancy and preeclampsia studies · Thyroid Disorders and Treatments · Endocrinology · Internal Medicine

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