TSH reference values in the first trimester of gestation and correlation between maternal TSH and obstetric and neonatal outcomes: a prospective Brazilian study
Arch. endocrinol. metab. (Online)
;
60(4): 314-318, Aug. 2016. tab, graf
Article
in English
| LILACS
| ID: lil-792948
ABSTRACT
ABSTRACT Objective To define the normal range of TSH in the first trimester of gestation and to evaluate the correlation between maternal TSH and obstetric and neonatal outcomes. Subjects and methods Prospective study. Women without known or clinically suspected thyroid disease and without risk factors for thyroid dysfunction, who became pregnant spontaneously and were initially evaluated up to week 12 of gestation, were included. Women with positive anti-thyroperoxidase antibodies, twin pregnancy, hyperemesis gravidarum, and trophoblastic disease were excluded. Results In the 660 pregnant women, the mean, median, and 2.5th and 97.5th percentiles of TSH were 0.9, 0.96, 0.04 and 2.68 mIU/L, respectively. TSH was undetectable in 2%, < 0.5 mIU/L in 17.4%, > 2 mIU/L in 9.7%, > 2.5 mIU/L in 4.7%, and > 3 mIU/L in 1%. None of the women received levothyroxine or antithyroid drugs during pregnancy. In addition, there was no difference in obstetric or neonatal outcomes when women with TSH ≤ 0.1, between 0.1 and 2.5, and between 2.5 and 4 mIU/L were compared. Conclusion In the population studied, the TSH value corresponding to the 97.5th percentile was 2.68 mIU/L in the first trimester of gestation.
Full text:
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Index:
LILACS (Americas)
Main subject:
Pregnancy Trimester, First
/
Pregnancy
/
Thyrotropin
/
Pregnancy Outcome
Type of study:
Observational study
/
Risk factors
Limits:
Adolescent
/
Adult
/
Female
/
Humans
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Arch. endocrinol. metab. (Online)
Journal subject:
Endocrinology
/
Metabolism
Year:
2016
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Santa Casa de Belo Horizonte/BR
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