IMPACT OF IODINE SUPPLEMENTATION ON SERUM TSH AND FREE T4 LEVELS IN PREGNANT WOMEN RESIDING IN MAHABAD CITY, 2015-2016

Abbasnezhad, P and Salehi Qaraveran, M and Entezar Mahdi, R and Nourooz Zadeh, J (2018) IMPACT OF IODINE SUPPLEMENTATION ON SERUM TSH AND FREE T4 LEVELS IN PREGNANT WOMEN RESIDING IN MAHABAD CITY, 2015-2016. The Journal of Urmia University of Medical Sciences, 29 (3). pp. 183-188.

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Abstract

A body of evidence indicates high prevalence of maternal iodine deficiency
despite adequacy of nutritional iodine status in school age children as a reference population in West
Azerbaijan province. Therefore, the present investigation was designed to evaluate the impact of oral
iodine supplementation (150 µg/day in the form of potassium iodate) for three months commencing at
12th week of gestation on serum thyroid stimulating hormone (TSH) and free thyroxine (FT4)
concentration.
Materials & Methods: Between September 2015 and May 2016, healthy pregnant women (n=49)
attending the first prenatal checkup were enrolled. Exclusion criteria were any history of thyroid
dysfunction and gestation week >6 weeks. Fasting blood samples were collected before iodine
supplementation at gestation weeks 6, 8, 10, 12, 14, 16 and post intervention at weeks 19, 24, 30,
respectively. Serum TSH and FT4 were measured by LIAISON analyzer (DiaSorin, Italy). Data analyses
were performed on SPSS software package (version 23).
Results: Mean TSH (mIU/L) at first-, second- and third trimesters were 1.90, 2.27 and 2.3, respectively.
Mean TSH before and after intervention were 1.98 and 2.43 (P<0.05). Frequencies of participants with
normal TSH levels before and after iodine intervention were 80.6% and 71.4%. Mean FT4 (ng/dL) at
first-, second- and third trimesters were 0.92, 0.77 and 0.7, respectively. Mean FT4 before and after
iodine supplementation were 0.87 and 0.72. Prevalence of subjects with normal FT4 levels before and
after iodine administration were 78.6% and 83%.
Conclusions: This investigation reveals that iodine administration was linked with a significant
elevation serum TSH levels. On the contrary, no difference was seen in the FT4 concentrations.
Prevalence of individuals with normal TSH and FT4 before and after iodine administration were 80.6%
and 71.4% vs 78.6% and 83.7%. The transient alternation in TSH and FT4 concentrations after iodine
administration is probably related to the surge in iodine (Wolff- Chaikoff effect). Further analyses are
needed to get an insight into the impact of iodine supplementation on the thyroid hormone profile during
pregnancy

Item Type: Article
Uncontrolled Keywords: Iodine supplementation, Pregnancy, Thyrotropin, Free thyroxin
Subjects: R Medicine > R Medicine (General)
Depositing User: Unnamed user with email gholipour.s@umsu.ac.ir
Date Deposited: 07 Jul 2018 07:29
Last Modified: 10 Feb 2019 07:07
URI: https://eprints.umsu.ac.ir/id/eprint/4899

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