Maternal Thyroid Function in Early Pregnancy and Their Relationship With Gestational Diabetes Mellitus

Study Overview
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Brief Summary
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This study was conducted to analyze the role of TSH level and TPOAb status in early pregnancy and use this information in assessment of the risk of gestational diabetes mellitus at different weeks of gestation when the FT4 level is normal.

Detailed Description
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A total of 7,729 women with singleton pregnancies who were receiving antenatal care at Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine between December 2012 and March 2014 were included in the study. All these women underwent screening for thyroid function (TSH,FT4 and TPOAb) at the first antenatal visit and a 75 g oral glucose tolerance test at 24-28 weeks of gestation. The correlation between a combination of TSH level and TPOAb status and the risk of gestational diabetes mellitus was analyzed.

Official Title
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Maternal TSH Level and TPOAb Status in Early Pregnancy and Their Relationship to the Risk of Gestational Diabetes Mellitus

Conditions
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Pregnancy, Thyroid Function Tests, Gestational Diabetes Mellitus

Intervention / Treatment
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* Other: 75g oral glucose tolerance test (OGTT)


Participation Criteria
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Eligibility Criteria
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Criteria: Inclusion Criteria: ≤19+6 weeks of gestation at the first antenatal visit; singleton pregnancy; FT4 level is within the normal range; TSH level is normal or beyond the normal range. Exclusion Criteria: age <18 years or >40 years; thyroid disease history before pregnancy, e.g. hyperthyroidism, clinical hypothyroidism and malignant tumors of the thyroid, regardless of medication treatment is needed or not; twin or multiple gestations; diagnosed with diabetes mellitus before pregnancy, or fasting blood-glucose level ≥ 7.0 mmol/L or HbA1C≥6.5% at the first antenatal visit; diseases causing abnormal glycometabolism or severe co-morbidities or diseases causing abnormal glycometabolism.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Women underwent screening for thyroid function<br>All these women underwent screening for thyroid function (TSH,FT4,TPOAb) at the first antenatal visit and the 75g oral glucose tolerance test (OGTT) at 24-28 weeks of gestation. The correlation between the combination of TSH level and TPOAb status and the risk of Gestational Diabetes Mellitus was analyzed. | Other: 75g oral glucose tolerance test (OGTT)<br>* All these women underwent the 75g oral glucose tolerance test (OGTT) at 24-28 weeks of gestation.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| 75g oral glucose tolerance test (OGTT) positive or not |  | 24-28 weeks |