{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T00:44:29Z","timestamp":1773276269111,"version":"3.50.1"},"reference-count":34,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2008,7,7]],"date-time":"2008-07-07T00:00:00Z","timestamp":1215388800000},"content-version":"vor","delay-in-days":2757,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clinical Endocrinology"],"published-print":{"date-parts":[[2000,12,19]]},"abstract":"<jats:p>Severe iodine deficiency disorders (IDDs) may have been eradicated in many parts of the world, but milder forms still exist and may escape detection. We evaluated the impact of pregnancy on the maternal and fetal thyroid axis in Hong Kong, a coastal city in southern China with borderline iodine intake.<\/jats:p><jats:p>A prospective study performed in a maternity hospital.<\/jats:p><jats:p>Two hundred and thirty pregnant women were prospectively studied and their neonates assessed at birth.<\/jats:p><jats:p>Urine iodine concentration, thyroid function tests and thyroid volume (TV) by ultrasound were determined in the mothers during pregnancy and up to 3\u2003months postpartum and in the neonates.<\/jats:p><jats:p>Increased urinary iodine concentration was seen from first trimester onwards and the proportion of women having urine iodine concentration of &lt;\u200a0\u00b74\u2003\u00b5mol\/l decreased from 11\u00b73% in the first trimester to 4\u00b77% in the third trimester. There was progressive reduction in circulating fT4 and fT3 concentrations and free thyroxine index (FTI) with increasing gestation and the percentage of women having subnormal levels at term were 53\u00b72%, 61\u00b71% and 4\u00b78%, respectively. The serum TSH concentration during pregnancy doubled towards term. In the first trimester, multiparous women had significantly larger TV than the nulliparous women (<jats:italic>P<\/jats:italic>\u2003&lt;\u20030\u00b7001). By the third trimester, TV had increased by 30% (range 3\u2013230%) so that the goitre incidence was 14\u00b71%, 21\u00b78%, 25\u00b79% during the three trimesters of pregnancy, and 24\u00b73% and 21\u00b79% at 6\u2003weeks and 3\u2003months postpartum (<jats:sc>ANOVA<\/jats:sc>, <jats:italic>P<\/jats:italic>\u2003&lt;\u20030\u00b705). The change in thyroid volume during pregnancy correlated positively with the change in thyroglobulin (<jats:italic>r<\/jats:italic>\u2003=\u20030\u00b7225, <jats:italic>P<\/jats:italic>\u2003&lt;\u20030\u00b7002) and negatively with urinary iodine concentration (<jats:italic>r<\/jats:italic>\u2003=\u2003\u2212\u20030\u00b7149, <jats:italic>P<\/jats:italic>\u2003&lt;\u20030\u00b702).<\/jats:p><jats:p>Fourteen women with excessive thyroidal stimulation in the second trimester (defined as those with thyroglobulin (Tg) concentrations in the highest tertile and FTI in the lowest tertile) were found to have lower urine iodine concentrations and larger TV (both <jats:italic>P<\/jats:italic>\u2003&lt;\u20030\u00b7005) throughout pregnancy, and their neonates had higher cord TSH (<jats:italic>P<\/jats:italic>\u2003&lt;\u20030\u00b705), Tg (<jats:italic>P<\/jats:italic>\u2003&lt;\u20030\u00b705) and slightly larger TV (<jats:italic>P<\/jats:italic>\u2003=\u20030\u00b706) as compared to the findings in 216 pregnant women without evidence of thyroid stimulation. Seven neonates (50%) born to these women had subnormal fT4 levels at birth.<\/jats:p><jats:p>In a borderline iodine sufficient area, pregnancy posed an important stress resulting in higher rates of maternal goitrogenesis as well as neonatal hypothyroxinaemia and hyperthyro\u2010 trophinaemia. An adequate iodization program is necessary to eliminate iodine deficiency disorders during pregnancy.<\/jats:p>","DOI":"10.1046\/j.1365-2265.2000.01156.x","type":"journal-article","created":{"date-parts":[[2003,3,11]],"date-time":"2003-03-11T10:47:17Z","timestamp":1047379637000},"page":"725-731","source":"Crossref","is-referenced-by-count":58,"title":["Goitrogenesis during pregnancy and neonatal hypothyroxinaemia in a borderline iodine sufficient area"],"prefix":"10.1111","volume":"53","author":[{"given":"A. W. C.","family":"Kung","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"T. T.","family":"Lao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M. T.","family":"Chau","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S. C. F.","family":"Tam","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"L. C. K.","family":"Low","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2008,7,7]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1210\/jc.84.2.561"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2265.1994.tb02560.x"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2265.1987.tb00784.x"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1210\/jc.77.3.587"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM199410203311608"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2265.1995.tb02620.x"},{"key":"e_1_2_6_8_1","first-page":"101","article-title":"Administration of iodized oil during pregnancy: a summary of the published evidence","volume":"74","author":"Delange F.","year":"1996","journal-title":"Bulletin of the WHO"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1089\/thy.1998.8.1185"},{"key":"e_1_2_6_10_1","first-page":"317","article-title":"Iodine deficiency disorders in Europe","volume":"67","author":"Delange F.","year":"1989","journal-title":"Bulletin of the WHO"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1159\/000242547"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1055\/s-0029-1212048"},{"key":"e_1_2_6_13_1","doi-asserted-by":"publisher","DOI":"10.1210\/jc.81.4.1332"},{"key":"e_1_2_6_14_1","doi-asserted-by":"publisher","DOI":"10.1089\/thy.1993.3.119"},{"key":"e_1_2_6_15_1","doi-asserted-by":"publisher","DOI":"10.1210\/jcem-26-12-1329"},{"key":"e_1_2_6_16_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF03348861"},{"key":"e_1_2_6_17_1","doi-asserted-by":"publisher","DOI":"10.1210\/edrv.18.3.0300"},{"key":"e_1_2_6_18_1","doi-asserted-by":"publisher","DOI":"10.1210\/jcem-71-2-276"},{"key":"e_1_2_6_19_1","doi-asserted-by":"publisher","DOI":"10.1210\/jc.80.1.258"},{"key":"e_1_2_6_20_1","doi-asserted-by":"publisher","DOI":"10.1210\/jc.75.3.800"},{"key":"e_1_2_6_21_1","first-page":"494","article-title":"Goitre epidemiology: thyroid volume, iodine excretion, thyroglobulin and thyrotropin in Germany and Sweden","volume":"112","author":"Gutekunst R.","year":"1986","journal-title":"Acta Endocrinologica"},{"key":"e_1_2_6_22_1","doi-asserted-by":"publisher","DOI":"10.1159\/000417535"},{"key":"e_1_2_6_23_1","first-page":"547","article-title":"Iodine deficiency and neonatal hypothyroidism","volume":"64","author":"Kochupillai N.","year":"1986","journal-title":"Bulletin of the WHO"},{"key":"e_1_2_6_24_1","first-page":"569","article-title":"Existence of iodine deficiency in Hong Kong \u2013 A coastal city in southern China","volume":"50","author":"Kung A.W.C.","year":"1996","journal-title":"European Journal of Clinical Nutrition"},{"key":"e_1_2_6_25_1","doi-asserted-by":"crossref","first-page":"264S","DOI":"10.1093\/ajcn\/57.2.264S","article-title":"The epidemiology of iodine deficiency diseases in China","volume":"57","author":"Ma T.","year":"1993","journal-title":"American Journal of Clinical Nutrition"},{"key":"e_1_2_6_26_1","doi-asserted-by":"publisher","DOI":"10.1210\/jc.77.4.1078"},{"key":"e_1_2_6_27_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0002-9378(11)80004-9"},{"key":"e_1_2_6_28_1","first-page":"55","volume-title":"The Thyroid and Pregnancy.","author":"Smyth P.P.A.","year":"1991"},{"key":"e_1_2_6_29_1","first-page":"840","article-title":"Maternal iodine status and thyroid volume during pregnancy: correlation with neonatal intake","volume":"82","author":"Smyth P.P.A.","year":"1997","journal-title":"Journal of Clinical Endocrinology and Metabolism"},{"key":"e_1_2_6_30_1","doi-asserted-by":"publisher","DOI":"10.1210\/jc.79.2.600"},{"key":"e_1_2_6_31_1","doi-asserted-by":"publisher","DOI":"10.2307\/3343436"},{"key":"e_1_2_6_32_1","unstructured":"WHO(1997) Elimination of iodine deficiency disorders in South\u2010east Asia. 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