Maternal and Fetal Thyroid Function
Abstract
Conception is followed by a series of hormonal and metabolic changes that involve most maternal endocrine systems. With regard to thyroid metabolism, these include an increase in serum thyroxine-binding globulin and thyroid hormone concentrations, increased renal clearance of iodine, and increased production and turnover of thyroxine (T)1. Fetal and maternal thyroid physiology differ, but the systems interact by means of the placenta and amniotic fluid, which modulate the transfer of iodine and small but important amounts of thyroid hormone from mother to fetus1,2. In this article we shall review recent data and new insights regarding the changes . . .
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Serum TSH levels may be below the nonpregnant reference range in the first half of a normal-term pregnancy, especially in gestational weeks 9-13.
“Serum TSH levels may be below the nonpregnant reference range in the first half of a normal-term pregnancy (435,436), and especially so in gestational weeks 9-13, during which a subset of pregnant women may develop a suppressed serum TSH (437-439).”
From 2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism and Other Causes of Thyrotoxicosis (2016) · cites this paper as [435]
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“Serum TSH levels may be below the nonpregnant reference range in the first half of a normal-term pregnancy (435,436), and especially so in gestational weeks 9–13, during which a subset of pregnant women may develop a suppressed serum TSH (437–439).”
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- Authors
- Epstein, F. H., Burrow, G. N., Fisher, D. A., & Larsen, P. R.
- Affiliations
- Yale University (US)
- Brigham and Women's Hospital (US)
- Venue
- New England Journal of Medicine
- Publisher
- Massachusetts Medical Society
- Published
- 1994-10-20
- Volume
- 331
- Issue
- 16
- Pages
- 1072-1078
- ISSN
- 0028-4793 (ISSN-L)
- 1533-4406
- OpenAlex
- W2088871053
- Cited by
- 720
- References
- 76
- Citations by year
- 2026: 13 · 2025: 14 · 2024: 21 · 2023: 17 · 2022: 26 · 2021: 21 · 2020: 25 · 2019: 22 · 2018: 25 · 2017: 26 · 2016: 31 · 2015: 22 · 2014: 20 · 2013: 22 · 2012: 22
- FWCI
- 3.71
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- New England Journal of Medicine (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of Diabetes and Digestive and Kidney Diseases (R01DK044128, DK36256, DK-44128, R01DK036256)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Birth, Development, and Health
- Health Sciences › Medicine › Obstetrics and Gynecology › Pregnancy and preeclampsia studies
- Keywords
- maternal thyroid function, fetal thyroid function, pregnancy, thyroid hormones, thyroxine-binding globulin, iodine metabolism, amniotic fluid
- MeSH terms
- Amniotic Fluid, Female, Fetus, Humans, Placenta, Pregnancy, Thyroid Gland, Thyroid Hormones, Thyronines
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Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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