ISSN: 1308-5727 | E-ISSN: 1308-5735
Volume : 5 Issue : 2 Year : 2024
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Turkish Society for Pediatric Endocrinology and Diabetes
Maternal and Neonatal Urinary Iodine Status and its Effect on Neonatal TSH Levels in a Mildly Iodine-Deficient Area [J Clin Res Pediatr Endocrinol]
J Clin Res Pediatr Endocrinol. 2013; 5(2): 90-94 | DOI: 10.4274/Jcrpe.997

Maternal and Neonatal Urinary Iodine Status and its Effect on Neonatal TSH Levels in a Mildly Iodine-Deficient Area

Arzu Kutlu Yaman1, Fatma Demirel2, Bahri Ermiş3, I. Etem Pişkin4
1Beypazarı State Hospital, Department of Pediatrics, Ankara, Turkey
2Ankara Child Disease Hematology and Oncology Training Hospital, Department of Pediatric Endocrinology, Ankara, Turkey
3Sakarya University, Medical School, Department of Neonatology Unit, Sakarya, Turkey
4Bülent Ecevit University, Medical School, Department of Pediatrics, Zonguldak, Turkey

Objective: Iodine deficiency and excess are the most important factors that affect screening and recall rates of congenital hypothyroidism. The purpose of this study was to investigate the urinary iodine status in newborns and their mothers and its effects on neonatal thyroid-stimulating hormone (TSH) levels in a mildly iodine-deficient area.
Methods: A total of 116 newborns and their mothers were included in the study. Urinary iodine levels were measured from healthy mothers and their babies on the 5th day following birth. Neonatal TSH levels were screened, and TSH and free thyroxine (fT4) levels were measured on the15th day in the recall cases. T4 treatment was started in infants with high TSH and low fT4 levels. These measurements were repeated on the 30th day in these newborns.
Results: Ninety-nine percent of the mothers included in the study were using iodized salt. The median urinary iodine level in the newborns was 279 µg/L, while it was 84 µg/L in their mothers. The rate of iodine deficiency among the mothers was 56.8%, and the rate of iodine excess was 8.6%. This rate was 10.3% for iodine deficiency and 61.2% for iodine excess in the newborns. The recall rate at the screening was 9.5% (n=11). The urinary iodine levels were above 200 µg/L in three newborns who had transient hyperthyrotropinemia.
Conclusions: Iodine deficiency was more frequently observed in nursing mothers, and iodine excess was more frequently seen in their newborns. The iodine excess noted in the newborns was attributed to the use of antiseptics containing iodine. The iodine excess leads to increases in recall rates, screening costs, and frequency of transient hyperthyrotropinemia.

Keywords: Urinary iodine, maternal, neonatal, screening, \r\nhyperthyrotropinemia\r\n

Arzu Kutlu Yaman, Fatma Demirel, Bahri Ermiş, I. Etem Pişkin. Maternal and Neonatal Urinary Iodine Status and its Effect on Neonatal TSH Levels in a Mildly Iodine-Deficient Area. J Clin Res Pediatr Endocrinol. 2013; 5(2): 90-94
Manuscript Language: English
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