Is TSH a Reliable Indicator of Thyroid Hormone Status in Pregnancy?

Author:

Karavani Gilad12ORCID,Daoud-Sabag Lina1,Chay Cherut3,Gillis David45,Strich David567

Affiliation:

1. Department of Obstetrics and Gynecology, Hadassah Ein-Kerem Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel

2. Infertility and IVF Unit, Hadassah Ein-Kerem Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel

3. Department of Family Medicine, Technion Israel Institute of Technology Ruth and Bruce Rappaport Faculty of Medicine, Tel Aviv, Israel

4. Department of Pediatrics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel

5. Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel

6. Pediatrics, Shaare Zedek Medical Center, Jerusalem, Israel

7. Pediatric Specialties, Shaare Zedek Medical Center, Jerusalem, Israel

Abstract

AbstractThyroid screening is recommended during pregnancy with serum thyrotropin (TSH) as the primary test. However, since human chorionic gonadotropin, the serum hallmark of pregnancy, has TSH-like effects, the adequacy of TSH as a screening tool in this constellation requires further study. This study aimed to evaluate the relationship between TSH and thyroid hormones during pregnancy in order to determine if TSH is an adequate screening tool. This was a retrospective study utilizing the Clalit Health Service, Jerusalem district database between 2006–2017 in which we analyzed TSH, FT4 and FT3 measurements from 32430 pregnancies resulting in live birth. We grouped FT4 and FT3 levels by trimester and by the following TSH levels: (1) below 0.1/0.2/0.3 mIU/l, (2) 0.1–2.5/0.2–3.0/0.3–3.0 mIU/l, (3) 2.6–4.0/3.1–4.0 mIU/l, (4) 4.1–10.0 mIU/l and (5) above 10.0 mIU/l. In the first trimester, the most important for fetal brain development, FT3 was below normal, defined as below the 2.5th percentile for the population, in only 15.3% of tests with TSH over 10 mIU/l. FT4 was below normal in only 12.8% of such tests. Similar findings were noted for the second and third trimesters. As expected, there were far less abnormal tests when lower TSH cutoff levels were tested. In conclusion, TSH levels beyond the range accepted as normal do not, in most cases, reflect abnormal thyroid hormone levels during pregnancy. TSH is not a good screen for overt hypothyroidism in pregnancy. This may be due, at least in the first trimester, to thyrotropic effects of HCG.

Publisher

Georg Thieme Verlag KG

Subject

Biochemistry (medical),Clinical Biochemistry,Endocrinology,Biochemistry,General Medicine,Endocrinology, Diabetes and Metabolism

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Dynamic Monitoring of Hypothyroidism During Pregnancy [Letter];International Journal of Women's Health;2023-10

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3