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What thyroid function tests are performed during pregnancy?

Jan 22, 2025 Source: Cainiu Health
Dr. Zhang Lu
Introduction
Thyroid function tests during pregnancy include measurements of thyroid-stimulating hormone (TSH), free thyroxine (FT4), total thyroxine (TT4), total triiodothyronine (TT3), and thyroid peroxidase antibodies (TPOAb). These testing items together form a comprehensive system for evaluating thyroid function during pregnancy, helping to promptly identify and manage thyroid dysfunction, thereby ensuring the health of both the pregnant woman and the fetus.

Generally, thyroid function tests during pregnancy include measurements of thyroid-stimulating hormone (TSH), free thyroxine (FT4), total thyroxine (TT4), total triiodothyronine (TT3), and thyroid peroxidase antibodies. Detailed explanations are as follows:

1. Thyroid-Stimulating Hormone (TSH) Measurement

Thyroid-stimulating hormone is a hormone secreted by the pituitary gland that acts on the thyroid gland to promote the secretion of T3 and T4. Measuring TSH levels in the blood can reflect the functional status of the hypothalamic-pituitary-thyroid axis.

2. Free Thyroxine (FT4) Measurement

Free thyroxine is one of the primary hormones secreted by the thyroid gland. It is not affected by serum protein concentrations and directly reflects the functional status of the thyroid gland. During pregnancy, FT4 measurement is commonly used to assess whether thyroid function is normal.

3. Total Thyroxine (TT4) Measurement

Total thyroxine refers to the total amount of thyroxine bound to thyroglobulin in the blood. Measuring TT4 levels provides further understanding of the thyroid gland's secretory function.

4. Total Triiodothyronine (TT3) Measurement

Total triiodothyronine refers to the total amount of triiodothyronine bound to thyroglobulin in the blood. Elevated TT3 levels often indicate hyperthyroidism, while decreased levels may suggest hypothyroidism.

5. Thyroid Peroxidase Antibody Testing

Thyroid peroxidase antibody is one of the important biomarkers of autoimmune thyroid diseases. A positive antibody result may indicate that the pregnant woman has an autoimmune thyroiditis, such as Hashimoto's thyroiditis.

Together, these tests form a comprehensive system for evaluating thyroid function during pregnancy, helping to promptly detect and manage thyroid dysfunction, thus ensuring the health of both the mother and the fetus.

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