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Related Experiment Video

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An Ex vivo Culture System to Study Thyroid Development

An Ex vivo Culture System to Study Thyroid Development

Published on: June 6, 2014

Ethnic differences in maternal thyroid parameters during pregnancy: the Generation R study.

Tim I M Korevaar¹, Marco Medici, Yolanda B de Rijke

¹The Generation R Study Group and Department of Internal Medicine, Erasmus Medical Center, 3015 GE, Rotterdam, The Netherlands.

The Journal of Clinical Endocrinology and Metabolism

|July 10, 2013

Summary

Ethnic differences in thyroid function tests during pregnancy exist. Using ethnicity-specific reference ranges significantly impacts diagnosing thyroid disease in pregnant women.

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Area of Science:

Endocrinology
Reproductive Health
Clinical Chemistry

Background:

Maternal thyroid dysfunction during pregnancy poses risks.
International guidelines recommend trimester-specific thyroid function test ranges.
Ethnicity influences thyroid function tests, but data are limited.

Purpose of the Study:

To investigate ethnic variations in thyroid function tests (TSH, free T4, T4) and TPO-antibody positivity in pregnant women.
To assess the impact of using population-based versus ethnicity-specific reference ranges on thyroid disease diagnosis.

Main Methods:

Analyzed serum TSH, free T4, T4, and TPO-antibody levels in 3944 pregnant women from the Generation R study.
Compared thyroid function test results across Dutch, Moroccan, Turkish, and Surinamese ethnic groups.

Main Results:

Mean TSH levels were higher in Dutch and Turkish women compared to Moroccan and Surinamese women.
T4 levels were lowest in Dutch women, with no significant differences in free T4.
Turkish women showed higher TPO-antibody positivity and elevated second-trimester TSH levels.
Using ethnicity-specific ranges altered diagnoses for 18% of women with initially abnormal thyroid function tests.

Conclusions:

Significant ethnic differences exist in maternal serum TSH, T4, and TPO-antibody positivity.
The choice of reference ranges (population-based vs. ethnicity-specific) critically affects thyroid disease diagnosis in pregnancy.