alexa Iodine status in pregnant women and their newborns: are our babies at risk of iodine deficiency?
Reproductive Medicine

Reproductive Medicine

Journal of Pregnancy and Child Health

Author(s): Travers CA, Guttikonda K, Norton CA, Lewis PR, Mollart LJ,

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Abstract OBJECTIVES: To determine whether pregnant women and their newborns show evidence of iodine deficiency, and to examine the correlation between maternal urine iodine concentration (UIC) and newborn thyroid-stimulating hormone (TSH) level. DESIGN: A cross-sectional study. SETTING: Hospital antenatal care services (March-May 2004) and private obstetrician clinics (June 2004) in the Central Coast area of New South Wales. PARTICIPANTS: 815 pregnant women (> or = 28 weeks' gestation) and 824 newborns. MAIN OUTCOME MEASURES: World Health Organization/International Council for the Control of Iodine Deficiency Disorders criteria for assessing severity of iodine deficiency (recommended levels: < 20\% of urine samples in a population with UIC < 50 microg/L; and < 3\% of newborns with whole-blood TSH level > 5 mIU/L). RESULTS: The median UIC for pregnant women was 85 microg/L, indicating mild iodine deficiency. Almost 17\% of pregnant women had a UIC < 50 microg/L, and 18 newborns (2.2\%) had TSH values > 5 mIU/L. There was no statistically significant linear correlation between neonatal whole-blood TSH level and maternal UIC (r = - 0.03; P = 0.4). Mothers with a UIC < 50 microg/L were 2.6 times (relative risk = 2.65; 95\% CI, 1.49-4.73; P = 0.01) more likely to have a baby with a TSH level > 5 mIU/L. CONCLUSION: The pregnant women surveyed were mildly iodine deficient. TSH values for their newborns were mostly within acceptable limits. Ongoing surveillance of the iodine status of NSW communities to establish trends over time is recommended.
This article was published in Med J Aust and referenced in Journal of Pregnancy and Child Health

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